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High7.5Red Hat Linux

High [CVE-2026-27135] Denial of Service via malformed HTTP/2 frames after session termination

This high-severity Red Hat Linux advisory covers CVE-2026-27135 affecting Red Hat JBoss Core Services on RHEL 7 Server, Red Hat JBoss Core Services on RHEL 8, Red Hat OpenShift Container Platform 4.12.

CVE-2026-27135 Published Mar 18, 2026
CVE-2026-27135
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service via malformed HTTP/2 frames after session termination. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-617. Affected package(s): rhcos, nodejs:20, rhpam, rhaiis/vllm-cuda-rhel9:1778274666, nghttp2, rhui5/haproxy-rhel9:1776868744.

Resolved in Red Hat advisory RHSA-2026:20040 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat JBoss Core Services on RHEL 7 Server; Red Hat JBoss Core Services on RHEL 8; Red Hat OpenShift Container Platform 4.12; Middleware Containers for OpenShift; and 57 more.

Affected versions
  • rhcos-412.86.202605271418-0
  • rhcos-414.92.202605060243-0
  • nodejs:20-8100020260414073138.489197e6
  • rhpam-7/rhpam-kieserver-rhel8:7.13.5-4.1777325709
  • nodejs:20-9060020260422064119.rhel9
  • rhpam-7/rhpam-smartrouter-rhel8:7.13.5-4.1777325708
  • rhaiis/vllm-cuda-rhel9:1778274666
  • nghttp2-0:1.43.0-6.el9_6.1
  • nghttp2-0:1.64.0-2.el10_1.1
  • rhui5/haproxy-rhel9:1776868744
  • rhui5/cds-rhel9:1776868774
  • nghttp2

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Fixed versions
  • RHSA-2026:20040

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

Mitigation checklist

Recommended fix / mitigation
  • Update the affected package(s) to the fixed version shipped in RHSA-2026:20040 (`sudo dnf update` / `yum update`).

Official advisory · high-confidence parse· fetched 2 months ago·verify at source

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