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High7.5Red Hat Linux

High [CVE-2026-42499] Denial of Service via pathological email address parsing

This high-severity Red Hat Linux advisory covers CVE-2026-42499 affecting Logging Subsystem for Red Hat OpenShift 6.4, Red Hat Advanced Cluster Security for Kubernetes 4.10, Red Hat Advanced Cluster Security for Kubernetes 4.9.

CVE-2026-42499 Published May 7, 2026
CVE-2026-42499
Affected products & platforms
Red Hat LinuxUnclassified
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Summary

Denial of Service via pathological email address parsing. Red Hat rates this important (CVSS 7.5).

Weakness: CWE-1046. Affected package(s): openshift-service-mesh/istio-proxyv2-rhel9:1782310747, openshift-service-mesh/istio-proxyv2-rhel9:1782303211, rhdh/rhdh-rhel9-operator:1782767215, openshift-service-mesh/istio-cni-rhel9:1782222217, openshift-service-mesh/istio-pilot-rhel9:1782223341, openshift-service-mesh/istio-pilot-rhel9:1782223138.

Resolved in Red Hat advisory RHSA-2026:33120 — update the affected packages (`sudo dnf update`).

Affected products named by the advisory: Logging Subsystem for Red Hat OpenShift 6.4; Red Hat Advanced Cluster Security for Kubernetes 4.10; Red Hat Advanced Cluster Security for Kubernetes 4.9; Red Hat Developer Hub 1.10; and 67 more.

Affected versions
  • openshift-service-mesh/istio-proxyv2-rhel9:1782310747
  • openshift-service-mesh/istio-proxyv2-rhel9:1782303211
  • rhdh/rhdh-rhel9-operator:1782767215
  • openshift-service-mesh/istio-cni-rhel9:1782222217
  • openshift-service-mesh/istio-pilot-rhel9:1782223341
  • openshift-service-mesh/istio-pilot-rhel9:1782223138
  • openshift-service-mesh/istio-pilot-rhel9:1782222366
  • openshift-service-mesh/istio-pilot-rhel9:1782224487
  • openshift-service-mesh/istio-rhel9-operator:1782222607
  • openshift-service-mesh/istio-cni-rhel9:1782222163
  • openshift-service-mesh/istio-proxyv2-rhel9:1782296193
  • openshift-service-mesh/istio-rhel9-operator:1782222038

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

Fixed versions
  • RHSA-2026:33120

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-2026:33120 (`sudo dnf update` / `yum update`).

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

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