RHSA-2021:3816 — Security Advisory
Red Hat Security Advisory: httpd:2.4 security update
Severity
ImportantRed Hat Product Security
Products
Official CSAF product identity
Published · October 13, 2021
Updated · November 2, 2026
Topic
An update for the httpd:2.4 module is now available for Red Hat Enterprise Linux 8.
Red Hat Product Security has rated this update as having a security impact of Important. 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 httpd packages provide the Apache HTTP Server, a powerful, efficient, and extensible web server.
Security Fix(es):
-
httpd: mod_proxy: SSRF via a crafted request uri-path containing "unix:" (CVE-2021-40438)
-
httpd: mod_session: Heap overflow via a crafted SessionHeader value (CVE-2021-26691)
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.