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GHSA-42WR-8M7M-5J62
Vulnerability from github – Published: 2026-09-07 15:33 – Updated: 2026-09-08 09:35
VLAI
Details
A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
Severity
7.5 (High)
{
"affected": [],
"aliases": [
"CVE-2026-18453"
],
"database_specific": {
"cwe_ids": [
"CWE-476"
],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-07T15:17:31Z",
"severity": "HIGH"
},
"details": "A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.",
"id": "GHSA-42wr-8m7m-5j62",
"modified": "2026-09-08T09:35:37Z",
"published": "2026-09-07T15:33:54Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-18453"
},
{
"type": "WEB",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509696"
},
{
"type": "WEB",
"url": "https://access.redhat.com/security/cve/CVE-2026-18453"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64804"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64793"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64792"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64791"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64790"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64789"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64785"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64784"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64783"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64781"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64780"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64779"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64778"
},
{
"type": "WEB",
"url": "https://access.redhat.com/errata/RHSA-2026:64776"
},
{
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}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
CVE-2026-18453 (GCVE-0-2026-18453)
Vulnerability from cvelistv5 – Published: 2026-09-07 14:14 – Updated: 2026-09-08 07:56
VLAI
EPSS
VEX
Title
389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search
Summary
A flaw was found in 389 Directory Server. A missing NULL pointer check in the paged results handling of op_shared_search allows an unauthenticated remote attacker to crash the LDAP server by sending a crafted sequence of search requests using the USE_ONE_BACKEND control, resulting in denial of service.
Severity
7.5 (High)
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
17 references
Impacted products
21 products
| Vendor | Product | Version | |
|---|---|---|---|
| Red Hat | Red Hat Directory Server 11.7 E4S for RHEL 8 |
Unaffected:
8080020260903102346.f969626e , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:11.7::el8 |
|
| Red Hat | Red Hat Directory Server 11.9 for RHEL 8 |
Unaffected:
8100020260904171440.37ed7c03 , < *
(rpm)
cpe:/a:redhat:directory_server:11.9::el8 |
|
| Red Hat | Red Hat Directory Server 12.2 E4S for RHEL 9 |
Unaffected:
9020020260903155914.1674d574 , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:12.2::el9 |
|
| Red Hat | Red Hat Directory Server 12.4 E4S for RHEL 9 |
Unaffected:
9040020260903102623.1674d574 , < *
(rpm)
cpe:/a:redhat:directory_server_e4s:12.4::el9 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
Unaffected:
0:3.2.0-10.el10_2 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:10.2 |
|
| Red Hat | Red Hat Enterprise Linux 10.0 Extended Update Support |
Unaffected:
0:3.0.6-21.el10_0 , < *
(rpm)
cpe:/o:redhat:enterprise_linux_eus:10.0 |
|
| Red Hat | Red Hat Enterprise Linux 7 Extended Lifecycle Support |
Unaffected:
0:1.3.11.1-15.el7_9 , < *
(rpm)
cpe:/o:redhat:rhel_els:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
8100020260904155442.25e700aa , < *
(rpm)
cpe:/a:redhat:enterprise_linux:8::appstream |
|
| Red Hat | Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support |
Unaffected:
8040020260901171549.96015a92 , < *
(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:
8040020260901171549.96015a92 , < *
(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:
8060020260901145727.824efc52 , < *
(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:
8060020260901145727.824efc52 , < *
(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:
8080020260831180218.6dbb3803 , < *
(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:
8080020260831180218.6dbb3803 , < *
(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:
0:2.8.0-10.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:
0:2.2.4-22.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:
0:2.4.5-29.el9_4 , < *
(rpm)
cpe:/a:redhat:rhel_e4s:9.4::appstream |
|
| Red Hat | Red Hat Enterprise Linux 9.6 Extended Update Support |
Unaffected:
0:2.6.1-24.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 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
|
Date Public
2026-09-07 09:00
Credits
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],
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"product": "Red Hat Directory Server 11.7 E4S for RHEL 8",
"vendor": "Red Hat",
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"vendor": "Red Hat",
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],
"defaultStatus": "affected",
"packageName": "389-ds-base",
"product": "Red Hat Enterprise Linux 7 Extended Lifecycle Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "0:1.3.11.1-15.el7_9",
"versionType": "rpm"
}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "8100020260904155442.25e700aa",
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}
]
},
{
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"cpes": [
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],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "8040020260901171549.96015a92",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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"cpe:/a:redhat:rhel_eus_long_life:8.4::appstream"
],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "8040020260901171549.96015a92",
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]
},
{
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],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support",
"vendor": "Red Hat",
"versions": [
{
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"status": "unaffected",
"version": "8060020260901145727.824efc52",
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}
]
},
{
"collectionURL": "https://access.redhat.com/downloads/content/package-browser/",
"cpes": [
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],
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"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On",
"vendor": "Red Hat",
"versions": [
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"status": "unaffected",
"version": "8060020260901145727.824efc52",
"versionType": "rpm"
}
]
},
{
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"cpes": [
"cpe:/a:redhat:rhel_e4s:8.8::appstream",
"cpe:/a:redhat:rhel_tus:8.8::appstream"
],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.8 Telecommunications Update Service",
"vendor": "Red Hat",
"versions": [
{
"lessThan": "*",
"status": "unaffected",
"version": "8080020260831180218.6dbb3803",
"versionType": "rpm"
}
]
},
{
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"cpes": [
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"cpe:/a:redhat:rhel_tus:8.8::appstream"
],
"defaultStatus": "affected",
"packageName": "389-ds:1.4",
"product": "Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions",
"vendor": "Red Hat",
"versions": [
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}
]
},
{
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"cpes": [
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"cpe:/a:redhat:enterprise_linux:9::crb"
],
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"product": "Red Hat Enterprise Linux 9",
"vendor": "Red Hat",
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{
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"product": "Red Hat Directory Server 12",
"vendor": "Red Hat"
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"cpes": [
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"vendor": "Red Hat"
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"credits": [
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"baseScore": 7.5,
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"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
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},
{
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"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64776"
},
{
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"x_refsource_REDHAT"
],
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},
{
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],
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},
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],
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},
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],
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},
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"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64785"
},
{
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"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64789"
},
{
"name": "RHSA-2026:64790",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64790"
},
{
"name": "RHSA-2026:64791",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64791"
},
{
"name": "RHSA-2026:64792",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64792"
},
{
"name": "RHSA-2026:64793",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64793"
},
{
"name": "RHSA-2026:64804",
"tags": [
"vendor-advisory",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/errata/RHSA-2026:64804"
},
{
"tags": [
"vdb-entry",
"x_refsource_REDHAT"
],
"url": "https://access.redhat.com/security/cve/CVE-2026-18453"
},
{
"name": "RHBZ#2509696",
"tags": [
"issue-tracking",
"x_refsource_REDHAT"
],
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2509696"
}
],
"timeline": [
{
"lang": "en",
"time": "2026-07-08T00:00:00.000Z",
"value": "Reported to Red Hat."
},
{
"lang": "en",
"time": "2026-09-07T09:00:00.000Z",
"value": "Made public."
}
],
"title": "389-ds-base: 389-ds-base: pre-authentication null pointer dereference via paged results and use_one_backend control in op_shared_search",
"workarounds": [
{
"lang": "en",
"value": "Red Hat has investigated whether a possible mitigation exists for this issue, and has not been able to identify a practical example. Please update the affected package as soon as possible."
}
],
"x_generator": {
"engine": "cvelib 1.8.0"
},
"x_redhatCweChain": "CWE-476: NULL Pointer Dereference"
}
},
"cveMetadata": {
"assignerOrgId": "53f830b8-0a3f-465b-8143-3b8a9948e749",
"assignerShortName": "redhat",
"cveId": "CVE-2026-18453",
"datePublished": "2026-09-07T14:14:48.845Z",
"dateReserved": "2026-07-31T06:49:45.234Z",
"dateUpdated": "2026-09-08T07:56:57.004Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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