RHSA-2026:59387 — Security Advisory
Red Hat Security Advisory: mod_http2 security, bug fix, and enhancement update
Severity
ModerateRed Hat Product Security
Products
Official CSAF product identity
Published · August 25, 2026
Updated · October 15, 2026
Topic
An update for mod_http2 is now available for Red Hat Enterprise Linux 9.
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.
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 [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.