RHSA-2026:17459HighCVSS 9.1

Red Hat Security Advisory: Assisted Installer RHEL 8 components for Multicluster Engine for Kubernetes 2.6.11

Published
May 14, 2026
Last Modified
August 6, 2026

🔗 CVE IDs covered (2)

CVE-2026-33186 →CVE-2026-34986 →

📋 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 CVE-2026-34986 — github.com/go-jose/go-jose/v3: github.com/go-jose/go-jose/v4: Go JOSE: Denial of Service via crafted JSON Web Encryption (JWE) object

🎯 Affected products21

  • multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:09ba33e68d741089a8e607c20ae1af90ef0f91886dbbfe5631a8b75bb4669db7_ppc64le as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:28c99d3465ede7fb9f34b8eec368093efe6e660b59ea407bfba309bffa63a35e_s390x as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:a805ad07ffbc1fd7de08b256b13fcb9cb8683f3ec13673905e62b4243072ce21_arm64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-image-service-rhel8@sha256:c667241161d798e4cbd92213630cffa4753c7234b723f4cd41838c9f7bae99e9_amd64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:04a8dd280a134d768f6818aa2d2af3ba9ad8f6d2226d536f763f2df3fb4816d8_s390x as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:1f7f0ecf658912226a17b7f08f9c1e1d0f3ebc3b8418e22a1fc4f2c62acd0af0_amd64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:609777a2ba9b3b9495be6829bbd33c7aeb5e4319d9b3e7015a31014a637999c5_arm64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-agent-rhel8@sha256:c4eaf8442a49e5ee5cd6e22e9bde7452f8bf7d40ae3faeb5e26019032bb24876_ppc64le as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:042d4a78d0eaa6c231e83065c44c53ec1fefba469d79c40c75e3570123533aea_ppc64le as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:1b4075ffcd5abcc5b7b08d712f68d8dd5a679553e9abcfe01fb762a2eaa90286_amd64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:2282ac22b99efbbe20be15ee09bbbdf22fd6ea8c9a996d33e21ccdc10fdc1458_arm64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-controller-rhel8@sha256:4f149b015e37d57ebbb3c50b40dff8c836293a63c0fcf410a8481f50c675d7de_s390x as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:28007e6ad17db1c94a61585ccee27e988faf87fc0e24330e7d298609687090f3_arm64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:689e63be09baa0e043df979b866d0127f2c8c1e8615725044f3185ed104f6c52_ppc64le as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:da3da57c5810ac09246d6e26c7eb1e0e82237f5cdcfa19a5dada1382e1938986_s390x as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-installer-rhel8@sha256:ea949dcf35cd91da78383750200501e4a2fa4048b568133dbd41a6b4be3357ab_amd64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2943c61fe779e15791fd0c806628b3e288735ceb18420ae68d4193e404c04a95_ppc64le as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:2c8700d7c53709f0d545dcaf715d467aa2746b172d964f0aaacc54be39b71cda_arm64 as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:c73bd91b103d4fd08ea587d0b94e0e4bc2a0488102d955e375a6229c3e0046a5_s390x as a component of multicluster engine for Kubernetes 2.6
  • registry.redhat.io/multicluster-engine/assisted-service-8-rhel8@sha256:db4f87f2ad1583f656147c4cf1a80becc7947c785022a131843ce60bb05f2f28_amd64 as a component of multicluster engine for Kubernetes 2.6

✅ Remediation

For more information about Assisted Installer, see the following documentation: https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.11/html/clusters/cluster_mce_overview#cim-intro For multicluster engine for Kubernetes, see the following documentation for details on how to install the images: https://docs.redhat.com/en/documentation/red_hat_advanced_cluster_management_for_kubernetes/2.11/html/clusters/cluster_mce_overview#mce-install-intro This documentation will be available after the general availability release of Red Hat Advanced Cluster Management 2.11. 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. Workaround: 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.

🔗 References (5)