RHSA-2026:36831
Vulnerability from csaf_redhat - Published: 2026-07-08 17:58 - Updated: 2026-09-30 14:47Summary
Red Hat Security Advisory: httpd:2.4 security update
Severity
Important
Notes
Topic: An update for the httpd:2.4 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: The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.
Security Fix(es):
* httpd: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)
* httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
* httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
* httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
* httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
* Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)
* httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)
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 Apache HTTP Server. This late release of memory after effective lifetime vulnerability allows a remote, unauthenticated attacker to cause a denial of service (DoS). The vulnerability can lead to resource exhaustion, making the server unavailable to legitimate users.
5.3 (Medium)
Affected products
Fixed
50 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-debugsource-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-devel-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-filesystem-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-manual-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-tools-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:httpd-tools-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_http2-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_http2-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_http2-debuginfo-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_http2-debugsource-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_ldap-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_ldap-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_md-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_md-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_md-debuginfo-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_md-debugsource-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_proxy_html-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_proxy_html-debuginfo-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_session-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_session-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_ssl-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.AUS:mod_ssl-debuginfo-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-debugsource-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-devel-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-filesystem-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-manual-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.noarch::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-tools-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:httpd-tools-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_http2-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_http2-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_http2-debuginfo-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_http2-debugsource-0:1.15.7-5.module+el8.6.0+24496+af8fe930.5.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_ldap-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_ldap-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_md-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.src::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_md-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_md-debuginfo-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_md-debugsource-1:2.0.8-8.module+el8.6.0+23843+c27a5dc4.1.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_proxy_html-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_proxy_html-debuginfo-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_session-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_session-debuginfo-0:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_ssl-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-8.6.0.Z.EUS.EXTENSION:mod_ssl-debuginfo-1:2.4.37-47.module+el8.6.0+24496+af8fe930.13.x86_64::httpd:2.4 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in mod_proxy_ajp of Apache HTTP Server. This heap-based buffer overflow vulnerability allows a remote attacker, by connecting to a malicious AJP (Apache JServ Protocol) server, to send a specially crafted message. This message can cause mod_proxy_ajp to write attacker-controlled data beyond a heap-based buffer, potentially leading to arbitrary code execution or a denial of service.
8.1 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Important
A flaw was found in the mod_authn_socache module of httpd. This vulnerability allows an unauthenticated remote user to crash a child process due to a NULL pointer dereference when the server is operating in a caching forward proxy configuration.
5.3 (Medium)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Moderate
A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the AJP getter functions attempt to read data beyond the allocated buffer size, allowing an attacker or a malformed request to cause an out-of-bounds read. This issue leads to a denial of service.
7.5 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Moderate
A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the server fails to properly check if a string is null-terminated before attempting to read it, allowing an attacker or a malformed request to cause a heap-based buffer over-read. This issue potentially leads to memory disclosure and a denial of service.
8.2 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Moderate
A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the ajp_parse_data function attempts to read data beyond the allocated buffer size, allowing an attacker or a malformed request to cause a heap-based buffer over-read. This issue potentially leads to memory disclosure and a denial of service.
8.2 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Moderate
A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are then held, leading to a denial of service (DoS) by rendering the server inaccessible.
7.5 (High)
Affected products
Fixed
50 products, the same list as for
CVE-2025-53020
Threats
Impact
Important
References
41 references
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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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"restart_required": {
"category": "none"
},
"url": "https://access.redhat.com/errata/RHSA-2026:36831"
},
{
"category": "workaround",
"details": "The attack surface can be reduced by disabling HTTP/2 support in Apache.\nFollow the guidance in Red Hat KCS article to:\n- Remove h2 and h2c from the Protocols directive\n- Disable mod_http2 and mod_proxy_http2 modules (if not required)\n\nhttps://access.redhat.com/node/7056356",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase"
},
{
"cve": "CVE-2026-28780",
"cwe": {
"id": "CWE-787",
"name": "Out-of-bounds Write"
},
"discovery_date": "2026-05-05T22:01:12.666022+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2466913"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in mod_proxy_ajp of Apache HTTP Server. This heap-based buffer overflow vulnerability allows a remote attacker, by connecting to a malicious AJP (Apache JServ Protocol) server, to send a specially crafted message. This message can cause mod_proxy_ajp to write attacker-controlled data beyond a heap-based buffer, potentially leading to arbitrary code execution or a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow",
"title": "Vulnerability summary"
},
{
"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-2026-28780"
},
{
"category": "external",
"summary": "RHBZ#2466913",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2466913"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-28780",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-28780"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-28780",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28780"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-05-05T21:29:41.527000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+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-2026:36831"
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "HIGH",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.1,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Important"
}
],
"title": "Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow"
},
{
"cve": "CVE-2026-33007",
"cwe": {
"id": "CWE-476",
"name": "NULL Pointer Dereference"
},
"discovery_date": "2026-05-04T15:01:24.989510+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2465299"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the mod_authn_socache module of httpd. This vulnerability allows an unauthenticated remote user to crash a child process due to a NULL pointer dereference when the server is operating in a caching forward proxy configuration.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This issue allows an unauthenticated remote attacker to cause a crash in a child process. However, the main parent process remains active and functional. Due to this reason, this flaw has been rated with a moderate severity.\n\nThis flaw only affects configurations with mod_authn_socache loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.",
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33007"
},
{
"category": "external",
"summary": "RHBZ#2465299",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2465299"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33007",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33007"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33007",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33007"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-05-04T14:41:27.520000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+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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"url": "https://access.redhat.com/errata/RHSA-2026:36831"
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{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 5.3,
"baseSeverity": "MEDIUM",
"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:L",
"version": "3.1"
},
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{
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"details": "Moderate"
}
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"title": "httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash"
},
{
"cve": "CVE-2026-33857",
"cwe": {
"id": "CWE-125",
"name": "Out-of-bounds Read"
},
"discovery_date": "2026-05-04T14:01:10.810459+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464953"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the AJP getter functions attempt to read data beyond the allocated buffer size, allowing an attacker or a malformed request to cause an out-of-bounds read. This issue leads to a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "To exploit this issue, the Apache HTTP Server must be configured to connect to an untrusted or compromised AJP backend server, limiting its exposure. Due to this reason, this flaw has been rated with a moderate severity.\n\nThis flaw only affects configurations with mod_proxy_ajp loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.",
"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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},
"references": [
{
"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-33857"
},
{
"category": "external",
"summary": "RHBZ#2464953",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464953"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-33857",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-33857"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-33857",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33857"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-05-04T13:07:30.753000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+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-2026:36831"
},
{
"category": "workaround",
"details": "Disabling mod_proxy_ajp and restarting httpd will mitigate this flaw.",
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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": "Moderate"
}
],
"title": "httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions"
},
{
"cve": "CVE-2026-34032",
"cwe": {
"id": "CWE-170",
"name": "Improper Null Termination"
},
"discovery_date": "2026-05-04T14:01:07.000400+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464952"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the server fails to properly check if a string is null-terminated before attempting to read it, allowing an attacker or a malformed request to cause a heap-based buffer over-read. This issue potentially leads to memory disclosure and a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "To exploit this issue, the Apache HTTP Server must be configured to connect to an untrusted or compromised AJP backend server, limiting its exposure. Due to this reason, this flaw has been rated with a moderate severity.\n\nThis flaw only affects configurations with mod_proxy_ajp loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.",
"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-2026-34032"
},
{
"category": "external",
"summary": "RHBZ#2464952",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464952"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34032",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34032"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34032",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34032"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-05-04T12:54:54.383000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+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-2026:36831"
},
{
"category": "workaround",
"details": "Disabling mod_proxy_ajp and restarting httpd will mitigate this flaw.",
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}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
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"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check"
},
{
"cve": "CVE-2026-34059",
"cwe": {
"id": "CWE-126",
"name": "Buffer Over-read"
},
"discovery_date": "2026-05-04T13:01:08.557596+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2464940"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the mod_proxy_ajp module of httpd. When processing AJP (Apache JServ Protocol) messages, the ajp_parse_data function attempts to read data beyond the allocated buffer size, allowing an attacker or a malformed request to cause a heap-based buffer over-read. This issue potentially leads to memory disclosure and a denial of service.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "To exploit this issue, the Apache HTTP Server must be configured to connect to an untrusted or compromised AJP backend server, limiting its exposure. Due to this reason, this flaw has been rated with a moderate severity.\n\nThis flaw only affects configurations with mod_proxy_ajp loaded and being used. This module can be disabled via the configuration file if its functionality is not being used.",
"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-2026-34059"
},
{
"category": "external",
"summary": "RHBZ#2464940",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2464940"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-34059",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-34059"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-34059",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34059"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-05-04T12:39:42.273000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+00:00",
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},
"url": "https://access.redhat.com/errata/RHSA-2026:36831"
},
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"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 8.2,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
"version": "3.1"
},
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],
"threats": [
{
"category": "impact",
"details": "Moderate"
}
],
"title": "httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()"
},
{
"cve": "CVE-2026-49975",
"cwe": {
"id": "CWE-409",
"name": "Improper Handling of Highly Compressed Data (Data Amplification)"
},
"discovery_date": "2026-06-05T06:04:44.009000+00:00",
"ids": [
{
"system_name": "Red Hat Bugzilla ID",
"text": "2485371"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in HTTP/2, affecting various web servers. A remote attacker can exploit this vulnerability by combining an HPACK compression bomb with a zero-byte flow-control window. This technique allows a small amount of data to expand into large memory allocations on the server, which are then held, leading to a denial of service (DoS) by rendering the server inaccessible.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "The Apache\u0027s `httpd` HTTP/2 protocol implementation has a denial-of-service (DoS) vulnerability that is rated as Important. An unauthenticated remote attacker can exploit this flaw by combining HPACK compression with flow control manipulation, leading to significant server memory exhaustion and rendering the service inaccessible. This vulnerability exists in default HTTP/2 configurations.",
"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-2026-49975"
},
{
"category": "external",
"summary": "RHBZ#2485371",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2485371"
},
{
"category": "external",
"summary": "RHSB-2026-007",
"url": "https://access.redhat.com/security/vulnerabilities/RHSB-2026-007"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-49975",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-49975"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-49975",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-49975"
},
{
"category": "external",
"summary": "https://blog.calif.io/p/codex-discovered-a-hidden-http2-bomb",
"url": "https://blog.calif.io/p/codex-discovered-a-hidden-http2-bomb"
}
],
"release_date": "2026-06-03T00:00:00+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-07-08T17:58:39+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-2026:36831"
},
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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": "httpd: httpd: HTTP/2 Remote Denial of Service via compression bomb and Slowloris-style attack"
}
]
}
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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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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