High7.4Red Hat Linux

High [CVE-2026-42264] Prototype pollution allows information disclosure and request manipulation

This high-severity Red Hat Linux advisory covers CVE-2026-42264 affecting Red Hat Advanced Cluster Security for Kubernetes 4.10, Red Hat Advanced Cluster Security for Kubernetes 4.11, Red Hat Advanced Cluster Security for Kubernetes 4.9.

CVE-2026-42264 Published May 8, 2026

CVE-2026-42264

Affected products & platforms

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Summary

Prototype pollution allows information disclosure and request manipulation. Red Hat rates this important (CVSS 7.4).

Weakness: CWE-915. Affected package(s): openshift-service-mesh/kiali-ossmc-rhel9:1782201851, advanced-cluster-security/rhacs-main-rhel8:1779371594, advanced-cluster-security/rhacs-main-rhel8:1779293013, openshift-service-mesh/kiali-rhel9:1782201812.

Resolved in Red Hat advisory RHSA-2026:20889 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Red Hat Advanced Cluster Security for Kubernetes 4.10; Red Hat Advanced Cluster Security for Kubernetes 4.11; Red Hat Advanced Cluster Security for Kubernetes 4.9; Red Hat OpenShift Service Mesh 3.1; and 25 more.

Affected versions

openshift-service-mesh/kiali-ossmc-rhel9:1782201851
advanced-cluster-security/rhacs-main-rhel8:1779371594
advanced-cluster-security/rhacs-main-rhel8:1779293013
openshift-service-mesh/kiali-rhel9:1782201812

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

Fixed versions

RHSA-2026:20889

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-2026:20889 (`sudo dnf update` / `yum update`).

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

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