RHSA-2026:92590
Vulnerability from csaf_redhat - Published: 2026-10-29 20:08 - Updated: 2026-11-05 12:47Summary
Red Hat Security Advisory: httpd security update
Severity
Important
Notes
Topic: An update for httpd is now available for Red Hat Enterprise Linux 7 Extended Lifecycle 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: The httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.
Security Fix(es):
* httpd: incomplete fix for CVE-2023-38709 (CVE-2024-42516)
* 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: NULL pointer dereference via specially crafted request (CVE-2026-29169)
* 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: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration (CVE-2026-29167)
* httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server (CVE-2026-44185)
* httpd: Apache HTTP Server: Denial of Service in mod_proxy_ftp via attacker-controlled FTP server (CVE-2026-44186)
* httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc (CVE-2026-42536)
* httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass (CVE-2026-34355)
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 httpd. The response headers are not sanitized before an HTTP response is sent when a malicious backend can insert a Content-Type, Content-Encoding, or some other headers. These issues lead to HTTP response splitting. This CVE provides a "complete" fix for CVE-2023-38709.
6.8 (Medium)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
25 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-manual-0:2.4.6-99.el7_9.8.noarch | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
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| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
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| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
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| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
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| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
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| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.x86_64 | — |
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
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
Threats
Impact
Important
A flaw was found in Apache HTTP Server when using the `mod_ldap` module in a per-directory configuration. This use-after-free vulnerability allows a remote attacker to potentially execute arbitrary code or cause a denial of service (DoS) due to improper memory handling. This could lead to system instability or unauthorized control over the affected server.
4.6 (Medium)
Affected products
Fixed
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
Threats
Impact
Low
A flaw was found in the mod_dav_lock module of httpd. This vulnerability allows a remote unauthenticated attacker to crash the server due to a NULL pointer dereference via a specially crafted request.
7.5 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
Threats
Impact
Low
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
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
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
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
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
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
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
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
Threats
Impact
Moderate
A vulnerability has been identified in the Apache HTTP Server. If the server is configured to connect to a malicious or compromised backend server, an attacker could exploit this flaw to bypass security controls or run unauthorized code on the system.
7.5 (High)
Affected products
Fixed
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
26 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.src | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-manual-0:2.4.6-99.el7_9.8.noarch | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
Threats
Impact
Important
A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution.
7.5 (High)
Affected products
Fixed
12 products, the same list as for
CVE-2026-34355
Known not affected
26 products, the same list as for
CVE-2026-34355
Threats
Impact
Important
A flaw was found in Apache HTTP Server. This buffer over-read vulnerability occurs when the server processes outbound Online Certificate Status Protocol (OCSP) requests directed to an attacker-controlled OCSP server. This could allow a remote attacker to read sensitive information from memory or cause a denial of service.
7.3 (High)
Affected products
Fixed
12 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_ssl-1:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:httpd-debuginfo-0:2.4.6-99.el7_9.8.x86_64 | — |
Vendor Fix
fix
Workaround
|
Known not affected
26 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.src | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-devel-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-manual-0:2.4.6-99.el7_9.8.noarch | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:httpd-tools-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-ELS:mod_session-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_ldap-0:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64 | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.ppc64le | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.s390x | — |
Workaround
|
|
| Unresolved product id: 7Server-optional-ELS:mod_proxy_html-1:2.4.6-99.el7_9.8.x86_64 | — |
Workaround
|
Threats
Impact
Important
A flaw was found in the `mod_proxy_ftp` module of the Apache HTTP Server. A remote attacker, by controlling a backend File Transfer Protocol (FTP) server, can trigger an infinite loop. This vulnerability, categorized as a Loop with Unreachable Exit Condition, leads to a Denial of Service (DoS) for the affected server.
7.3 (High)
Affected products
Fixed
13 products, the same list as for
CVE-2024-42516
Known not affected
25 products, the same list as for
CVE-2024-42516
Threats
Impact
Important
References
64 references
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{
"system_name": "Red Hat Bugzilla ID",
"text": "2374549"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in httpd. The response headers are not sanitized before an HTTP response is sent when a malicious backend can insert a Content-Type, Content-Encoding, or some other headers. These issues lead to HTTP response splitting. This CVE provides a \"complete\" fix for CVE-2023-38709.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: incomplete fix for CVE-2023-38709",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This flaw is only exploitable by a malicious backend or a malicious application, but may also affect forward proxy configurations.\n\nThis issue is classified as a Moderate vulnerability because successful exploitation requires a highly specific and constrained setup. Namely, the attacker must already have the ability to influence backend responses\u2014such as injecting malicious headers like Content-Type or Content-Encoding\u2014which typically implies a compromised or poorly controlled upstream service. In properly configured systems, frontend servers like Apache sanitize or strictly validate backend output, limiting exposure. Furthermore, HTTP response splitting does not inherently lead to remote code execution or privilege escalation on the server itself; instead, its effects are typically confined to manipulating client-side behavior such as caching or redirection.",
"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-2024-42516"
},
{
"category": "external",
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"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2374549"
},
{
"category": "external",
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"url": "https://www.cve.org/CVERecord?id=CVE-2024-42516"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2024-42516",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2024-42516"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
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"release_date": "2025-07-14T07:13:28.880000+00:00",
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{
"category": "vendor_fix",
"date": "2026-10-29T20:08:24+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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},
{
"category": "workaround",
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{
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"baseScore": 6.8,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "HIGH",
"privilegesRequired": "NONE",
"scope": "CHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:H/A:N",
"version": "3.1"
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{
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{
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}
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{
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"title": "Vulnerability description"
},
{
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"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"
}
],
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"baseScore": 8.1,
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},
{
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"name": "Expired Pointer Dereference"
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"ids": [
{
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"text": "2486394"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache HTTP Server when using the `mod_ldap` module in a per-directory configuration. This use-after-free vulnerability allows a remote attacker to potentially execute arbitrary code or cause a denial of service (DoS) due to improper memory handling. This could lead to system instability or unauthorized control over the affected server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: Apache HTTP Server: Arbitrary code execution or denial of service via use-after-free in mod_ldap per-directory configuration",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "CISA\u0027s 9.8 is a mechanical worst-case UAF score. Their vector is AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H \u2014 they\u0027re treating it as: \"network-facing service, memory corruption primitive, assume RCE.\" This is how CISA-ADP routinely scores any UAF in a network daemon. They don\u0027t analyze actual exploitability; they score the theoretical ceiling of the vulnerability class.\n\nApache\u0027s LOW reflects what actually happens. \n\n1. Trigger is narrow \u2014 mod_ldap must be loaded (not default) AND configured in per-directory context (\u003cDirectory\u003e, \u003cLocation\u003e, .htaccess). Server-wide LDAP config doesn\u0027t trigger it. This is an unusual configuration pattern.\n2. UAF in config merging, not request handling \u2014 the freed memory is in the per-directory configuration merge path, which constrains the timing window and what objects occupy the freed allocation. This isn\u0027t a heap spray-friendly UAF in a hot request path.\n3. httpd\u0027s process model kills RCE reliability \u2014 prefork uses separate processes (crash = one child dies, parent respawns), worker/event have per-process address space. Turning a UAF into reliable RCE against httpd is substantially harder than against a single-threaded daemon with a predictable heap layout.\n4. Realistic impact is DoS \u2014 the freed pointer will most likely cause a segfault (child crash), not a controlled write primitive. The parent process respawns workers, so even the DoS is transient.",
"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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"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.",
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{
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"title": "Vulnerability description"
},
{
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"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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{
"category": "external",
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"date": "2026-10-29T20:08:24+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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"title": "Vulnerability description"
},
{
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"title": "Vulnerability summary"
},
{
"category": "other",
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"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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"title": "Vulnerability description"
},
{
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},
{
"category": "other",
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"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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{
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},
{
"category": "external",
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},
{
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{
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"ids": [
{
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"title": "Vulnerability description"
},
{
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"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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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: Apache HTTP Server: Buffer overflow in mod_proxy_html allows security bypass",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "This Important vulnerability in `mod_proxy_html` within the Apache HTTP Server allows an untrusted backend to trigger a buffer overflow. This could lead to a security bypass or arbitrary code execution, posing a significant risk in environments where `httpd` is configured with untrusted backend services.",
"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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"scope": "UNCHANGED",
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"name": "Buffer Copy without Checking Size of Input"
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"ids": [
{
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"text": "2486411"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in Apache HTTP Server, specifically within the mod_xml2enc module. This heap-based buffer overflow vulnerability can be triggered when processing untrusted content through the xml2StartParse function. A remote attacker could potentially exploit this to cause a denial of service, information disclosure, or possibly arbitrary code execution.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: Apache HTTP Server: Heap-based Buffer Overflow via untrusted content in mod_xml2enc",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "In Red Hat Enterprise Linux (RHEL), the httpd package includes mod_xml2enc, which provides encoding support for filters like mod_proxy_html. Because this flaw relies on processing unvetted or untrusted input text lengths, the impact presents a high risk to availability (Denial of Service via worker crashes) and a potential risk to confidentiality if an attacker is capable of executing remote code within the context of the apache or httpd daemon process.",
"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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{
"category": "self",
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"url": "https://access.redhat.com/security/cve/CVE-2026-42536"
},
{
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"summary": "RHBZ#2486411",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486411"
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"url": "https://www.cve.org/CVERecord?id=CVE-2026-42536"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-42536",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42536"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-06-08T15:23:46.290000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-29T20:08:24+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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"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: Apache HTTP Server: Buffer Over-read via outbound OCSP requests to attacker-controlled server",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A critical buffer over-read flaw in Apache HTTP Server occurs when it performs outbound OCSP requests. If a server connects to an attacker-controlled OCSP responder, a remote attacker can leak sensitive memory data or trigger a denial of service (DoS). This risk depends entirely on the server\u0027s OCSP configuration and endpoint trustworthiness.",
"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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},
{
"category": "external",
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"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44185"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
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],
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{
"category": "vendor_fix",
"date": "2026-10-29T20:08:24+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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"system_name": "Red Hat Bugzilla ID",
"text": "2486402"
}
],
"notes": [
{
"category": "description",
"text": "A flaw was found in the `mod_proxy_ftp` module of the Apache HTTP Server. A remote attacker, by controlling a backend File Transfer Protocol (FTP) server, can trigger an infinite loop. This vulnerability, categorized as a Loop with Unreachable Exit Condition, leads to a Denial of Service (DoS) for the affected server.",
"title": "Vulnerability description"
},
{
"category": "summary",
"text": "httpd: Apache HTTP Server: Denial of Service in mod_proxy_ftp via attacker-controlled FTP server",
"title": "Vulnerability summary"
},
{
"category": "other",
"text": "A loop with an unreachable exit condition flaw was found in the mod_proxy_ftp module of the Apache HTTP Server. A remote attacker could exploit this vulnerability by tricking the server into connecting to a malicious or compromised backend FTP server, causing the proxy_ftp_handler component to enter an infinite loop. This results in CPU exhaustion and a denial of service (DoS) condition on the affected system.",
"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": [
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"category": "self",
"summary": "Canonical URL",
"url": "https://access.redhat.com/security/cve/CVE-2026-44186"
},
{
"category": "external",
"summary": "RHBZ#2486402",
"url": "https://bugzilla.redhat.com/show_bug.cgi?id=2486402"
},
{
"category": "external",
"summary": "https://www.cve.org/CVERecord?id=CVE-2026-44186",
"url": "https://www.cve.org/CVERecord?id=CVE-2026-44186"
},
{
"category": "external",
"summary": "https://nvd.nist.gov/vuln/detail/CVE-2026-44186",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-44186"
},
{
"category": "external",
"summary": "https://httpd.apache.org/security/vulnerabilities_24.html",
"url": "https://httpd.apache.org/security/vulnerabilities_24.html"
}
],
"release_date": "2026-06-08T15:11:12.743000+00:00",
"remediations": [
{
"category": "vendor_fix",
"date": "2026-10-29T20:08:24+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-2026:92590"
},
{
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{
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"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "LOW",
"baseScore": 7.3,
"baseSeverity": "HIGH",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
"version": "3.1"
},
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}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.