Medium6.5Red Hat Linux

Medium [CVE-2026-47204] Denial of Service via Connect protocol request

This medium-severity Red Hat Linux advisory covers CVE-2026-47204 affecting Red Hat OpenShift Service Mesh 3.0, Red Hat OpenShift Service Mesh 3.1, Red Hat OpenShift Service Mesh 3.2.

CVE-2026-47204 Published Jun 26, 2026Updated by vendor Jun 26, 2026

CVE-2026-47204

Affected products & platforms

Red Hat LinuxUnclassified

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Summary

Envoy is an open source edge and service proxy designed for cloud-native applications. From 1.26.0 until 1.35.13, 1.36.9, 1.37.5, and 1.38.3, the envoy.filters.http.grpc_stats filter crashes (null pointer dereference / segfault) when a Connect protocol request (Content-Type: application/connect+proto or application/connect+json) hits a direct_response route.

This vulnerability is fixed in 1.35.13, 1.36.9, 1.37.5, and 1.38.3. A remote attacker can exploit this vulnerability by sending a specially crafted Connect protocol request to a direct response route.

This action causes the `envoy.filters.http.grpc_stats` filter to crash, leading to a denial of service (DoS) for the Envoy process. This can disrupt services relying on the proxy.

This vulnerability affects Red Hat OpenShift Service Mesh and cloud.redhat.com services that utilize Envoy, potentially disrupting service availability. Red Hat severity: Moderate — CVSS 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H).

Weakness: CWE-476. Affected Red Hat products: Red Hat OpenShift Service Mesh 3.0; Red Hat OpenShift Service Mesh 3.1; Red Hat OpenShift Service Mesh 3.2; Red Hat OpenShift Service Mesh 3.3; OpenShift Service Mesh 2.

Will not fix / out of support: OpenShift Service Mesh 2. Red Hat fixing advisory: RHSA-2026:49705, RHSA-2026:49729, RHSA-2026:49744, RHSA-2026:49765.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

Fixed versions

1.35.13
1.36.9
1.37.5
1.38.3
openshift-service-mesh/istio-proxyv2-rhel9:1784908682
openshift-service-mesh/istio-proxyv2-rhel9:1784953556
openshift-service-mesh/istio-proxyv2-rhel9:1784953743
openshift-service-mesh/istio-proxyv2-rhel9:1784908639
RHSA-2026:49705
RHSA-2026:49729
RHSA-2026:49744
RHSA-2026:49765

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

Mitigation checklist

Recommended fix / mitigation

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.

Official advisory · high-confidence parse· fetched 12 days ago·verify at source

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