Summary
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 [almalinux-9] (JIRA:AlmaLinux-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.
Fixed packages 1
| Release | Package | Fixed in |
|---|---|---|
| AlmaLinux · 9 | mod_http2 | 2.0.26-6.el9_8.2 |
Vulnerabilities 2
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High 7.3
Apache HTTP Server: mod_http2 memory corruption when file handles exhausted
Use After Free vulnerability in Apache HTTP Server module mod_http2 when file handles are already exhausted. This issue affects Apache HTTP Server: from 2.4.55 through 2.4.67.
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Medium 6.5
Apache HTTP Server: OOB Read in `merge_response_headers` can cause crash
Out-of-bounds Read vulnerability in Apache HTTP Server with mod_headers and mod_mime and multiple response languages. This issue affects Apache HTTP Server: from 2.4.0 through 2.4.67.