RHSA-2026:55860HighCVSS 7.5

Red Hat Security Advisory: haproxy security update

Published
August 17, 2026
Last Modified
August 17, 2026

🔗 CVE IDs covered (1)

CVE-2026-55204 →

📋 Description

CVE-2026-55204 — haproxy: HAProxy: Denial of Service via HPACK dynamic table insertions

🎯 Affected products13

  • Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • haproxy-0:1.8.27-5.el8_8.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-0:1.8.27-5.el8_8.2.src as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-0:1.8.27-5.el8_8.2.src as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • haproxy-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • haproxy-debuginfo-0:1.8.27-5.el8_8.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-debuginfo-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-debuginfo-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)
  • haproxy-debugsource-0:1.8.27-5.el8_8.2.ppc64le as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-debugsource-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream E4S (v.8.8)
  • haproxy-debugsource-0:1.8.27-5.el8_8.2.x86_64 as a component of Red Hat Enterprise Linux AppStream TUS (v.8.8)

✅ 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: Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.

🔗 References (4)