RHSA-2026:27957HighCVSS 9.1

Red Hat Security Advisory: OpenShift Virtualization v4.20 Images

Published
June 22, 2026
Last Modified
August 19, 2026

🔗 CVE IDs covered (1)

CVE-2026-33186 →

📋 Description

CVE-2026-33186 — google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation

🎯 Affected products7

  • Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:11b6c74ac8775309613003f1f580f80b63c82fc650a261d8808236548476ca49_s390x as a component of Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:2ed9f59221ef39fd2ff36ed163db76efb9e5fd537e0c60a604070018e97996aa_amd64 as a component of Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:81590327f5b942ba4070bce6c55ba6c46a1d12a97e263a49060ebe2f56744171_arm64 as a component of Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:2cfc75420ae496b051e75d4f4b3efb68c41a3e16772d9080051a784d93550efe_s390x as a component of Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:2e72070b7b1e91d4d2c070dcfe100d5553fec8936d538b53937c25bdf1e81330_amd64 as a component of Red Hat Container Native Virtualization 4.20
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:d4bc7c875714e9310470deb70e3225e2efd7eb1033d491dab3c55cdc943031ef_arm64 as a component of Red Hat Container Native Virtualization 4.20

✅ Remediation

Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://access.redhat.com/articles/11258 Workaround: To mitigate this issue, implement infrastructure-level normalization to ensure all incoming HTTP/2 `:path` headers are properly formatted with a leading slash before reaching the gRPC-Go server. This can be achieved by configuring a reverse proxy or API gateway to validate and normalize the `:path` header. Ensure that any such intermediary is properly configured and restarted to apply the changes, which may temporarily impact service availability.

🔗 References (4)