RHSA-2026:22140HighCVSS 8.2

Red Hat Security Advisory: httpd:2.4 security update

Published
June 1, 2026
Last Modified
September 21, 2026

🔗 CVE IDs covered (6)

CVE-2026-33007 →CVE-2026-33857 →CVE-2026-34032 →CVE-2026-34059 →CVE-2025-53020 →CVE-2026-28780 →

📋 Description

CVE-2025-53020 — mod_http2: Apache HTTP Server: HTTP/2 DoS by Memory Increase CVE-2026-28780 — Apache HTTP Server: mod_proxy_ajp: Apache HTTP Server mod_proxy_ajp: Arbitrary code execution via heap-based buffer overflow CVE-2026-33007 — httpd: mod_authn_socache: NULL pointer dereference can cause a child process crash CVE-2026-33857 — httpd: mod_proxy_ajp: off-by-one out-of-bounds reads in AJP getter functions CVE-2026-34032 — httpd: mod_proxy_ajp: heap-based buffer over-read due to missing null-termination check CVE-2026-34059 — httpd: mod_proxy_ajp: heap-based buffer over-read and memory disclosure in ajp_parse_data()

🎯 Affected products86

  • Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.src (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debugsource-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debugsource-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debugsource-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-debugsource-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-devel-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-devel-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-devel-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-devel-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-filesystem-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-manual-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.noarch (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.s390x (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • httpd-tools-debuginfo-0:2.4.37-65.module+el8.10.0+24281+ea10630c.8.x86_64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_http2-0:1.15.7-10.module+el8.10.0+24315+35fe59d0.5.aarch64 (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • mod_http2-0:1.15.7-10.module+el8.10.0+24315+35fe59d0.5.ppc64le (httpd:2.4) as a component of Red Hat Enterprise Linux AppStream (v. 8)
  • +56 more not shown

✅ Remediation

For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 Workaround: The attack surface can be reduced by disabling HTTP/2 support in Apache. Follow the guidance in Red Hat KCS article to: - Remove h2 and h2c from the Protocols directive - Disable mod_http2 and mod_proxy_http2 modules (if not required) https://access.redhat.com/node/7056356 Workaround: Disabling mod_authn_socache and restarting httpd will mitigate this flaw. Workaround: Disabling mod_proxy_ajp and restarting httpd will mitigate this flaw.

🔗 References (9)