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High7.5Red Hat Linux

High [CVE-2026-33814] Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame

This high-severity Red Hat Linux advisory covers CVE-2026-33814 affecting Red Hat Hardened Images, Red Hat Openshift Data Foundation 4.22, Red Hat OpenShift Service Mesh 3.1.

CVE-2026-33814 Published May 7, 2026
CVE-2026-33814
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-606.

Affected package(s): golang1, cluster-observability-operator/distributed-tracing-console-plugin-pf5-rhel9:1782839981, openshift-service-mesh/istio-cni-rhel9:1782222217, cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9:1782840519, openshift-service-mesh/istio-pilot-rhel9:1782223138, openshift-service-mesh/istio-pilot-rhel9:1782222366.

Resolved in Red Hat advisory RHSA-2026:23262 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Hardened Images; Red Hat Openshift Data Foundation 4.22; Red Hat OpenShift Service Mesh 3.1; Red Hat OpenShift Service Mesh 3.2; and 29 more.

Affected versions
  • golang1-25-main-1.25.11-2.hum1
  • cluster-observability-operator/distributed-tracing-console-plugin-pf5-rhel9:1782839981
  • openshift-service-mesh/istio-cni-rhel9:1782222217
  • cluster-observability-operator/distributed-tracing-console-plugin-pf4-rhel9:1782840519
  • openshift-service-mesh/istio-pilot-rhel9:1782223138
  • openshift-service-mesh/istio-pilot-rhel9:1782222366
  • openshift-service-mesh/istio-pilot-rhel9:1782224487
  • cluster-observability-operator/distributed-tracing-console-plugin-rhel9:1782838753
  • cluster-observability-operator/logging-console-plugin-pf4-rhel9:1782839279
  • cluster-observability-operator/monitoring-console-plugin-pf5-rhel9:1782844225
  • openshift-service-mesh/istio-cni-rhel9:1782222163
  • openshift-service-mesh/istio-rhel9-operator:1782222038

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

Fixed versions
  • RHSA-2026:23262

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-2026:23262 (`sudo dnf update` / `yum update`).

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

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