RHSA-2026:36846 - Security Advisory

Topic

An update for the httpd:2.4 module is now available for Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support and Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On.

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: Apache HTTP Server: HTTP/2 DoS by Memory Increase (CVE-2025-53020)
• httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data() (CVE-2026-34059)
• httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check (CVE-2026-34032)
• httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions (CVE-2026-33857)
• httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash (CVE-2026-33007)
• Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow (CVE-2026-28780)
• httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack (CVE-2026-49975)

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.

Solution

For details on how to apply this update, which includes the changes described in this advisory, refer to:

https://access.redhat.com/articles/11258

Affected Products

• Red Hat Enterprise Linux for x86_64 - Extended Life Cycle Long Life 8.4 x86_64
• Red Hat Enterprise Linux Server - AUS 8.4 x86_64

Fixes

• BZ - 2379343 - CVE-2025-53020 mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase
• BZ - 2464940 - CVE-2026-34059 httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()
• BZ - 2464952 - CVE-2026-34032 httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check
• BZ - 2464953 - CVE-2026-33857 httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions
• BZ - 2465299 - CVE-2026-33007 httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash
• BZ - 2466913 - CVE-2026-28780 Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow
• BZ - 2485371 - CVE-2026-49975 httpd: HTTP/2: Remote Denial of Service via compression bomb and Slowloris-style attack

CVEs

• CVE-2025-53020
• CVE-2026-28780
• CVE-2026-33007
• CVE-2026-33857
• CVE-2026-34032
• CVE-2026-34059
• CVE-2026-49975

References

• https://access.redhat.com/security/updates/classification/#important