High7.5Red Hat Linux

High [CVE-2026-47774] HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack

This high-severity Red Hat Linux advisory covers CVE-2026-47774 affecting Red Hat OpenShift Service Mesh 2.6, Red Hat OpenShift Service Mesh 3.1, Red Hat OpenShift Service Mesh 3.2.

CVE-2026-47774 Published Jun 4, 2026

CVE-2026-47774

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

HTTP/2 Remote Denial of Service via HPACK compression bomb and Slowloris-style attack. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-409. Affected package(s): openshift-service-mesh/istio-proxyv2-rhel9:1781069908, openshift-service-mesh/istio-proxyv2-rhel9:1781070158, openshift-service-mesh/istio-proxyv2-rhel9:1781070967, openshift-service-mesh/proxyv2-rhel9:1781604724, openshift-service-mesh/istio-proxyv2-rhel9:1781094520.

Resolved in Red Hat advisory RHSA-2026:26210 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat OpenShift Service Mesh 2.6; Red Hat OpenShift Service Mesh 3.1; Red Hat OpenShift Service Mesh 3.2; Red Hat OpenShift Service Mesh 3.3; and 1 more.

Affected versions

openshift-service-mesh/istio-proxyv2-rhel9:1781069908
openshift-service-mesh/istio-proxyv2-rhel9:1781070158
openshift-service-mesh/istio-proxyv2-rhel9:1781070967
openshift-service-mesh/proxyv2-rhel9:1781604724
openshift-service-mesh/istio-proxyv2-rhel9:1781094520

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

Fixed versions

RHSA-2026:26210

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-2026:26210 (`sudo dnf update` / `yum update`).

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

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