Red Hat Security Advisory: mod_http2 security, bug fix, and enhancement update
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.
AI Analysis
Technical Summary
The mod_http2 module in Apache HTTP Server, which implements HTTP/2 protocol support for httpd 2.4 servers, contains two vulnerabilities: a Use After Free (CVE-2026-48913) that may allow arbitrary code execution or denial of service, and an Out-of-bounds Read (CVE-2026-43951) in mod_headers and mod_mime. These issues affect Red Hat Enterprise Linux 10 across various architectures. Red Hat Product Security has issued an advisory (RHSA-2026:34355) and released updated mod_http2 packages (version 2.0.29-4.el10_2.2) to fix these vulnerabilities. The update is classified as moderate severity. No CVSS score is provided in the advisory.
Potential Impact
The Use After Free vulnerability in mod_http2 can lead to arbitrary code execution or denial of service, posing a significant risk to affected systems. The Out-of-bounds Read vulnerability may cause information disclosure or application instability. Both vulnerabilities affect the Apache HTTP Server mod_http2 module on Red Hat Enterprise Linux 10. Exploitation could impact server availability and security.
Mitigation Recommendations
Red Hat has released updated mod_http2 packages (version 2.0.29-4.el10_2.2) that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 should apply these official updates promptly to remediate the issues. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated in the advisory.
Red Hat Security Advisory: mod_http2 security, bug fix, and enhancement update
Description
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.
Affected software
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AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The mod_http2 module in Apache HTTP Server, which implements HTTP/2 protocol support for httpd 2.4 servers, contains two vulnerabilities: a Use After Free (CVE-2026-48913) that may allow arbitrary code execution or denial of service, and an Out-of-bounds Read (CVE-2026-43951) in mod_headers and mod_mime. These issues affect Red Hat Enterprise Linux 10 across various architectures. Red Hat Product Security has issued an advisory (RHSA-2026:34355) and released updated mod_http2 packages (version 2.0.29-4.el10_2.2) to fix these vulnerabilities. The update is classified as moderate severity. No CVSS score is provided in the advisory.
Potential Impact
The Use After Free vulnerability in mod_http2 can lead to arbitrary code execution or denial of service, posing a significant risk to affected systems. The Out-of-bounds Read vulnerability may cause information disclosure or application instability. Both vulnerabilities affect the Apache HTTP Server mod_http2 module on Red Hat Enterprise Linux 10. Exploitation could impact server availability and security.
Mitigation Recommendations
Red Hat has released updated mod_http2 packages (version 2.0.29-4.el10_2.2) that address these vulnerabilities. Users of Red Hat Enterprise Linux 10 should apply these official updates promptly to remediate the issues. Detailed update instructions are available at https://access.redhat.com/articles/11258. No additional mitigation steps are indicated in the advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:34355
- Cve Count
- 2
- Additional Cves
- ["CVE-2026-48913"]
- Cvss Version
- null
Threat ID: 6a46ed0327e9c79719445203
Added to database: 07/02/2026, 22:58:11 UTC
Last enriched: 07/22/2026, 01:42:00 UTC
Last updated: 08/16/2026, 01:28:42 UTC
Views: 138
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