RHSA-2026:34355
Vulnerability from csaf_redhat - Published: 2026-07-01 16:54 - Updated: 2026-07-02 07:29Summary
Red Hat Security Advisory: mod_http2 security, bug fix, and enhancement update
Severity
Moderate
Notes
Topic: An update for mod_http2 is now available for Red Hat Enterprise Linux 10.
Red Hat Product Security has rated this update as having a security impact of Moderate. 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 mod_h2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.
Security Fix(es):
* httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code execution or denial of service. (CVE-2026-48913)
* httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime (CVE-2026-43951)
Bug Fix(es) and Enhancement(s):
* address CVE-2026-43951 and CVE-2026-48913 in mod_http2 (JIRA:RHEL-188008)
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. An out-of-bounds read vulnerability exists when `mod_headers` and `mod_mime` are used with multiple response languages. This could allow a remote attacker to disclose sensitive information from memory or cause a denial of service.
6.5 (Medium)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
A flaw was found in the Apache HTTP Server's mod_http2 module. This vulnerability, known as a Use After Free, occurs when the server's file handles are exhausted. An attacker could potentially exploit this to cause a denial of service or, in some cases, execute arbitrary code, leading to system compromise.
7.3 (High)
Affected products
Fixed
13 products
| Product | Identifier | Version | Remediation |
|---|---|---|---|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.src | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debuginfo-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.aarch64 | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.ppc64le | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.s390x | — |
Vendor Fix
fix
Workaround
|
|
| Unresolved product id: AppStream-10.2.Z:mod_http2-debugsource-0:2.0.29-4.el10_2.2.x86_64 | — |
Vendor Fix
fix
Workaround
|
Threats
Impact
Moderate
References
14 references
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{
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"title": "Vulnerability description"
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"text": "httpd: Apache HTTP Server: Out-of-bounds Read in mod_headers and mod_mime",
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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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"title": "Vulnerability description"
},
{
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},
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},
{
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"threats": [
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],
"title": "httpd: mod_http2: Apache HTTP Server mod_http2: Use After Free vulnerability allows arbitrary code execution or denial of service."
}
]
}
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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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