RHSA-2026:27892HighCVSS 9.1

Red Hat Security Advisory: OpenShift Virtualization v4.21 Images

Published
June 22, 2026
Last Modified
July 27, 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 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:503da66fe09453f2227ee7e0945ce50eafdbca05b6fb70177f716d5076ae85d1_s390x as a component of Red Hat Container Native Virtualization 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:7ea195b07092de48e437dbb3e90632f1d25054891ee7d171930a88c2cdd51a6e_amd64 as a component of Red Hat Container Native Virtualization 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-csi-driver-rhel9@sha256:af54ece0c1118c8e83de5b12657535b8f2a78fdac734d4e3edf3cb9fbbcdb537_arm64 as a component of Red Hat Container Native Virtualization 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:2616b32a119196479838d427d8354ebb9013dd4fdf6c52faee1e31cebc2b3392_amd64 as a component of Red Hat Container Native Virtualization 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:c5ab47c065bc8c5e327737b7fdcce65f7ae2c7c340d52b0ba27fbfed3060866b_arm64 as a component of Red Hat Container Native Virtualization 4.21
  • registry.redhat.io/container-native-virtualization/hostpath-provisioner-rhel9@sha256:dbf1619a761f82de049b0ead1c9ae390775cbc3e0881fc4e8f8a8410753276a4_s390x as a component of Red Hat Container Native Virtualization 4.21

✅ 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)