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CVE-2026-9064 (GCVE-0-2026-9064)
Vulnerability from cvelistv5 – Published: 2026-05-20 09:00 – Updated: 2026-06-30 12:05
VLAI
EPSS
Title
389-ds-base: 389-ds-base: unbounded ldap controls count in get_ldapmessage_controls_ext() causes cpu and heap amplification (remote dos)
Summary
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
Severity
7.5 (High)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
- CWE-770 - Allocation of Resources Without Limits or Throttling
Assigner
References
20 references
Impacted products
48 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11.5 E4S for RHEL 8 |
Unaffected:
8060020260609102432.0ca98e7e , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:11.5::el8 |
|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 |
Unaffected:
8080020260610130252.f969626e , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:11.7::el8 |
|
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 |
Unaffected:
8100020260601104139.37ed7c03 , < *
(rpm)
cpe:/a:redhat:directory_server:11.9::el8 |
|
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 |
Unaffected:
9020020260615123354.1674d574 , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:12.2::el9 |
|
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 |
Unaffected:
9040020260611130021.1674d574 , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:12.4::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.2.0-7.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.0.6-18.el10_0 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:1.3.11.1-12.el7_9 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260601102239.25e700aa , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
8040020260609102422.96015a92 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On |
Unaffected:
8040020260609102422.96015a92 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.4::appstream cpe:/a:redhat:rhel_eus_long_life:8.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support |
Unaffected:
8060020260609102416.824efc52 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On |
Unaffected:
8060020260609102416.824efc52 , < *
(rpm)
cpe:/a:redhat:rhel_aus:8.6::appstream cpe:/a:redhat:rhel_eus_long_life:8.6::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Telecommunications Update Service |
Unaffected:
8080020260610125847.6dbb3803 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions |
Unaffected:
8080020260610125847.6dbb3803 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:8.8::appstream cpe:/a:redhat:rhel_tus:8.8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 9 |
Unaffected:
0:2.8.0-7.el9_8 , < *
(rpm)
cpe:/a:redhat:enterprise_linux:9::appstream cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions |
Unaffected:
0:2.2.4-18.el9_2 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.2::appstream |
|
| Red Hat | Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions |
Unaffected:
0:2.4.5-25.el9_4 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:2.6.1-21.el9_6 , < *
(rpm)
cpe:/a:redhat:rhel_eus:9.6::appstream cpe:/a:redhat:rhel_eus:9.6::crb |
|
| Red Hat | Red Hat Directory Server 13.2 |
Unaffected:
1781714123 , < *
(rpm)
cpe:/a:redhat:directory_server:13.2::el10 |
|
| Red Hat | Red Hat Directory Server 12 |
cpe:/a:redhat:directory_server:12 |
|
| Red Hat | Red Hat Directory Server 13 |
cpe:/a:redhat:directory_server:13 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux Server (v. 7 ELS) |
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Enterprise Linux Server Optional (v. 7 ELS) |
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 |
cpe:/a:redhat:directory_server:11.9::el8 |
|
| Red Hat | Red Hat Enterprise Linux AppStream EUS (v. 10.0) |
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 10) |
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 8) |
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream AUS (v.8.4) |
cpe:/a:redhat:rhel_aus:8.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) |
cpe:/a:redhat:rhel_eus_long_life:8.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream AUS (v.8.6) |
cpe:/a:redhat:rhel_aus:8.6::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.6) |
cpe:/a:redhat:rhel_eus_long_life:8.6::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream E4S (v.8.8) |
cpe:/a:redhat:rhel_e4s:8.8::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream TUS (v.8.8) |
cpe:/a:redhat:rhel_tus:8.8::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream E4S (v.9.2) |
cpe:/a:redhat:rhel_e4s:9.2::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream E4S (v.9.4) |
cpe:/a:redhat:rhel_e4s:9.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream EUS (v.9.6) |
cpe:/a:redhat:rhel_eus:9.6::appstream |
|
| Red Hat | Red Hat Enterprise Linux AppStream (v. 9) |
cpe:/a:redhat:enterprise_linux:9::appstream |
|
| Red Hat | Red Hat Directory Server 11.5 E4S for RHEL 8 |
cpe:/a:redhat:directory_server_e4s:11.5::el8 |
|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 |
cpe:/a:redhat:directory_server_e4s:11.7::el8 |
|
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 |
cpe:/a:redhat:directory_server_e4s:12.2::el9 |
|
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 |
cpe:/a:redhat:directory_server_e4s:12.4::el9 |
|
| Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) |
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) |
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat CodeReady Linux Builder EUS (v.9.6) |
cpe:/a:redhat:rhel_eus:9.6::crb |
|
| Red Hat | Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) |
cpe:/a:redhat:enterprise_linux:9::crb |
|
| Red Hat | Red Hat Directory Server 13.2 |
cpe:/a:redhat:directory_server:13.2::el10 |
Date Public
2026-05-20 07:30
Credits
Red Hat would like to thank Oleh Konko (1seal.org) for reporting this issue.
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RHSA-2026:26458
Vulnerability from csaf_redhat - Published: 2026-06-17 00:37 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: redhat-ds:11 security update
Severity
Important
Notes
Topic: An update for the redhat-ds:11 module is now available for Red Hat Directory Server 11.9 for RHEL 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages for server administration.
Additional Changes:
For detailed information on changes in this release, see the Red Hat Directory Server 11.9 for RHEL 8 Release Notes linked from the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.src::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-debuginfo-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-debugsource-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-devel-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-legacy-tools-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-legacy-tools-debuginfo-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-libs-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-libs-debuginfo-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-snmp-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:389-ds-base-snmp-debuginfo-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:cockpit-389-ds-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 8Base-DirSrv-11.9:python3-lib389-0:1.4.3.39-24.module+el8dsrv+24341+2b6b9665.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
9 references
Acknowledgments
1seal.org
Oleh Konko
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"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-9064"
},
{
"category": "external",
"summary": "RHBZ#2480093",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480093"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9064",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9064"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064"
}
],
"release_date": "2026-05-20T07:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-17T00:37:31+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26458"
},
{
"category": "workaround",
"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26459
Vulnerability from csaf_redhat - Published: 2026-06-17 01:52 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: 389-ds:1.4 security update
Severity
Important
Notes
Topic: An update for the 389-ds:1.4 module is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
42 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.src::389-ds:1.4 | — |
Vendor Fix
fix
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|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
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|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debugsource-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debugsource-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debugsource-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-debugsource-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-devel-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-devel-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-devel-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-devel-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-libs-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.aarch64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.ppc64le::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.s390x::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:389-ds-base-snmp-debuginfo-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.10.0.Z.MAIN.EUS:python3-lib389-0:1.4.3.39-24.module+el8.10.0+24340+7270ac72.noarch::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
9 references
Acknowledgments
1seal.org
Oleh Konko
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{
"names": [
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"organization": "1seal.org"
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"cve": "CVE-2026-9064",
"cwe": {
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"name": "Allocation of Resources Without Limits or Throttling"
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{
"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26459"
},
{
"category": "workaround",
"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26460
Vulnerability from csaf_redhat - Published: 2026-06-17 01:30 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: 389-ds:1.4 security update
Severity
Important
Notes
Topic: An update for the 389-ds:1.4 module is now available for Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
24 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.src::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-debugsource-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-devel-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-legacy-tools-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-libs-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-libs-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-snmp-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:389-ds-base-snmp-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.AUS:python3-lib389-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.noarch::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.src::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-debugsource-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-devel-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-legacy-tools-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-libs-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-libs-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-snmp-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:389-ds-base-snmp-debuginfo-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:python3-lib389-0:1.4.3.34-9.module+el8.6.0+24371+47116d61.noarch::389-ds:1.4 | — |
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Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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{
"acknowledgments": [
{
"names": [
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"organization": "1seal.org"
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"cve": "CVE-2026-9064",
"cwe": {
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"name": "Allocation of Resources Without Limits or Throttling"
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"discovery_date": "2026-03-05T00:00:00+00:00",
"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "2480093"
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{
"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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{
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"summary": "RHBZ#2480093",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480093"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9064",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9064"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064"
}
],
"release_date": "2026-05-20T07:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-17T01:30:36+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26460"
},
{
"category": "workaround",
"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26461
Vulnerability from csaf_redhat - Published: 2026-06-17 00:50 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: redhat-ds:11 security update
Severity
Important
Notes
Topic: An update for the redhat-ds:11 module is now available for Red Hat Directory Server 11.5 E4S for RHEL 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.src::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-debuginfo-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-debugsource-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-devel-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-legacy-tools-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-libs-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-libs-debuginfo-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-snmp-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:389-ds-base-snmp-debuginfo-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:cockpit-389-ds-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.6.0.Z.E4S-DirSrv-11.5-E4S:python3-lib389-0:1.4.3.34-6.module+el8dsrv+24373+7e48d0d8.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"vulnerabilities": [
{
"acknowledgments": [
{
"names": [
"Oleh Konko"
],
"organization": "1seal.org"
}
],
"cve": "CVE-2026-9064",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-03-05T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480093"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-9064"
},
{
"category": "external",
"summary": "RHBZ#2480093",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480093"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9064",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9064"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064"
}
],
"release_date": "2026-05-20T07:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-17T00:50:06+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26461"
},
{
"category": "workaround",
"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26463
Vulnerability from csaf_redhat - Published: 2026-06-17 01:38 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: 389-ds:1.4 security update
Severity
Important
Notes
Topic: An update for the 389-ds:1.4 module is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
24 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.src::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-debugsource-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-devel-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-legacy-tools-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-libs-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-libs-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-snmp-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.4.0.Z.AUS:389-ds-base-snmp-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.AUS:python3-lib389-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.noarch::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.src::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-debugsource-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-devel-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-legacy-tools-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-libs-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-libs-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-snmp-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:389-ds-base-snmp-debuginfo-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.x86_64::389-ds:1.4 | — |
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| Unresolved product id: AppStream-8.4.0.Z.EUS.EXTENSION:python3-lib389-0:1.4.3.34-4.module+el8.4.0+24372+0c6355a1.noarch::389-ds:1.4 | — |
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Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"acknowledgments": [
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"names": [
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{
"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
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}
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"category": "vendor_fix",
"date": "2026-06-17T01:38:56+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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],
"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:26463"
},
{
"category": "workaround",
"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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],
"scores": [
{
"cvss_v3": {
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"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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]
}
],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26464
Vulnerability from csaf_redhat - Published: 2026-06-17 01:40 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: 389-ds-base security update
Severity
Important
Notes
Topic: An update for 389-ds-base is now available for Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
26 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-0:2.4.5-25.el9_4.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debuginfo-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debuginfo-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debuginfo-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debuginfo-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debugsource-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debugsource-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debugsource-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-debugsource-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-debuginfo-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-debuginfo-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-debuginfo-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-libs-debuginfo-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-snmp-debuginfo-0:2.4.5-25.el9_4.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-snmp-debuginfo-0:2.4.5-25.el9_4.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-snmp-debuginfo-0:2.4.5-25.el9_4.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:389-ds-base-snmp-debuginfo-0:2.4.5-25.el9_4.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.4.0.Z.E4S:python3-lib389-0:2.4.5-25.el9_4.noarch | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
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{
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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}
RHSA-2026:26465
Vulnerability from csaf_redhat - Published: 2026-06-17 01:59 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: 389-ds-base security update
Severity
Important
Notes
Topic: An update for 389-ds-base is now available for Red Hat Enterprise Linux 9.6 Extended Update Support.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: 389 Directory Server is an LDAP version 3 (LDAPv3) compliant server. The base packages include the Lightweight Directory Access Protocol (LDAP) server and command-line utilities for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-0:2.6.1-21.el9_6.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-9.6.0.Z.EUS:python3-lib389-0:2.6.1-21.el9_6.noarch | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-debugsource-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-devel-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-devel-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-devel-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-devel-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-libs-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: CRB-9.6.0.Z.EUS:389-ds-base-snmp-debuginfo-0:2.6.1-21.el9_6.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"names": [
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"organization": "1seal.org"
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"cve": "CVE-2026-9064",
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"name": "Allocation of Resources Without Limits or Throttling"
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"discovery_date": "2026-03-05T00:00:00+00:00",
"ids": [
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"system_name": "Red Hat Bugzilla ID",
"text": "2480093"
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"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
"product_status": {
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"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-9064"
},
{
"category": "external",
"summary": "RHBZ#2480093",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2480093"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-9064",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-9064"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-9064"
}
],
"release_date": "2026-05-20T07:30:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-06-17T01:59:27+00:00",
"details": "For details on how to apply this update, which includes the changes described in this advisory, refer to:\n\nhttps://access.redhat.com/articles/11258",
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},
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
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"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26597
Vulnerability from csaf_redhat - Published: 2026-06-17 14:11 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: redhat-ds:11 security update
Severity
Important
Notes
Topic: An update for the redhat-ds:11 module is now available for Red Hat Directory Server 11.7 E4S for RHEL 8.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.src::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-debuginfo-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-debugsource-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-devel-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-legacy-tools-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-legacy-tools-debuginfo-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-libs-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-libs-debuginfo-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-snmp-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:389-ds-base-snmp-debuginfo-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.x86_64::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:cockpit-389-ds-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-8.8.0.Z.E4S-DirSrv-11.7-E4S:python3-lib389-0:1.4.3.34-15.module+el8dsrv+24378+c77f3fdd.noarch::redhat-ds:11 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
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"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
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"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"details": "Restrict network access to the LDAP port (389/tcp, 636/tcp) to trusted networks only using firewall rules or network ACLs. This prevents untrusted remote attackers from reaching the vulnerable code path.\n\nOptionally, lower the nsslapd-maxbersize configuration parameter to reduce the maximum BER message size accepted by the server. Note that this caps bytes, not the number of controls, and does not fully eliminate the amplification. Setting it too low may impact legitimate LDAP operations with large payloads.",
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
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"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26599
Vulnerability from csaf_redhat - Published: 2026-06-17 14:19 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: redhat-ds:12 security update
Severity
Important
Notes
Topic: An update for the redhat-ds:12 module is now available for Red Hat Directory Server 12.4 E4S for RHEL 9.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.src::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-debuginfo-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-debugsource-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-devel-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-libs-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-libs-debuginfo-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-snmp-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:389-ds-base-snmp-debuginfo-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:cockpit-389-ds-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.noarch::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.4.0.Z.E4S-DirSrv-12.4-E4S:python3-lib389-0:2.4.5-23.module+el9dsrv+24381+1cd2f394.noarch::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
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{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
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"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
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}
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"threats": [
{
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"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
RHSA-2026:26639
Vulnerability from csaf_redhat - Published: 2026-06-17 15:46 - Updated: 2026-06-30 10:14Summary
Red Hat Security Advisory: redhat-ds:12 security update
Severity
Important
Notes
Topic: An update for the redhat-ds:12 module is now available for Red Hat Directory Server 12.2 E4S for RHEL 9.
Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
Details: Red Hat Directory Server is an LDAPv3-compliant directory server. The suite of packages includes the Lightweight Directory Access Protocol (LDAP) server, as well as command-line utilities and Web UI packages for server administration.
Security Fix(es):
* 389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS) (CVE-2026-9064)
For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.
Terms of Use: This content is licensed under the Creative Commons Attribution 4.0 International License (https://creativecommons.org/licenses/by/4.0/). If you distribute this content, or a modified version of it, you must provide attribution to Red Hat Inc. and provide a link to the original.
A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.
7.5 (High)
Affected products
Fixed
11 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.src::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-debuginfo-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-debugsource-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-devel-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-libs-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-libs-debuginfo-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-snmp-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:389-ds-base-snmp-debuginfo-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.x86_64::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:cockpit-389-ds-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.noarch::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: BaseOS-9.2.0.Z.E4S-DirSrv-12.2-E4S:python3-lib389-0:2.2.7-15.module+el9dsrv+24397+ec2d72b6.noarch::redhat-ds:12 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Important
References
8 references
Acknowledgments
1seal.org
Oleh Konko
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{
"acknowledgments": [
{
"names": [
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],
"organization": "1seal.org"
}
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"cve": "CVE-2026-9064",
"cwe": {
"id": "CWE-770",
"name": "Allocation of Resources Without Limits or Throttling"
},
"discovery_date": "2026-03-05T00:00:00+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2480093"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in 389-ds-base. The get_ldapmessage_controls_ext() function in the LDAP server does not enforce an upper bound on the number of controls per LDAP message. A remote, unauthenticated attacker can send a specially crafted LDAP request containing hundreds of thousands of minimal controls within the default maximum BER message size (2 MB), causing excessive CPU consumption and heap allocation on the server. Under concurrent exploitation, this leads to significant latency degradation, worker thread starvation, or out-of-memory termination, resulting in a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This vulnerability is rated Important for Red Hat products shipping 389-ds-base. A remote, unauthenticated attacker with network access to the LDAP port can send a single crafted LDAP request containing an excessive number of minimal controls, causing the server to perform unbounded memory allocations and consume significant CPU time. Under concurrent attack, this can degrade or deny directory service availability through worker thread starvation or out-of-memory conditions.\n\nThe vulnerability is mitigated in environments where the LDAP port is not exposed to untrusted networks (firewall/ACL restrictions). Additionally, lowering nsslapd-maxbersize reduces the maximum message size (and thus the upper bound on controls per message), though this does not fully eliminate the amplification since it caps bytes rather than control count. The definitive fix requires enforcing a maximum controls-per-message limit in the decode loop.",
"title": "Statement"
},
{
"category": "general",
"text": "The CVSS score(s) listed for this vulnerability do not reflect the associated product\u0027s status, and are included for informational purposes to better understand the severity of this vulnerability.",
"title": "CVSS score applicability"
}
],
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"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "389-ds-base: 389-ds-base: unbounded LDAP controls count in get_ldapmessage_controls_ext() causes CPU and heap amplification (remote DoS)"
}
]
}
Loading…
Trend slope:
-
(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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