RHSA-2026:59387: Moderate: mod_http2 security, bug fix, and enhancement update
The modh2 Apache httpd module implements the HTTP2 protocol (h2+h2c) on top of libnghttp2 for httpd 2.4 servers.Security Fix(es): httpd: modhttp2: Apache HTTP Server modhttp2: Use After Free vulnerability allows arbitrary code execution or denial of service. (CVE-2026-48913) httpd: Apache HTTP Server: Out-of-bounds Read in modheaders and modmime (CVE-2026-43951) Bug Fix(es) and Enhancement(s): address CVE-2026-43951 and CVE-2026-48913 in modhttp2 [rhel-9] (JIRA:RHEL-190583) 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
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
httpd: Apache HTTP Server mod_http2to a version that resolves this vulnerability.Patch JIRA:RHEL-190583
Event History
Frequently Asked Questions
Which components are implicated by this update?
The update addresses vulnerabilities in Apache HTTP Server components mod_http2, mod_headers, and mod_mime. The mod_http2 module implements HTTP/2, including h2 and h2c, for httpd 2.4 servers.
What are the potential consequences of the fixed issues?
CVE-2026-48913 is a use-after-free vulnerability in mod_http2 that may allow arbitrary code execution or denial of service. CVE-2026-43951 is an out-of-bounds read affecting mod_headers and mod_mime.
What platform scope is explicitly identified for the fixes?
The bug-fix entry explicitly identifies mod_http2 fixes for RHEL 9. No other operating-system or product-version scope is provided in the advisory data.