RHSA-2026:9440HighCVSS 9.1

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.0.10

Published
April 21, 2026
Last Modified
July 27, 2026

🔗 CVE IDs covered (4)

CVE-2026-25679 →CVE-2026-33186 →CVE-2026-33747 →CVE-2026-33748 →

📋 Description

CVE-2026-25679 — net/url: Incorrect parsing of IPv6 host literals in net/url 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-2026-33747 — BuildKit: github.com/moby/buildkit: BuildKit: Arbitrary file write and code execution via untrusted frontend CVE-2026-33748 — github.com/moby/buildkit: BuildKit: Unauthorized file access via Git URL fragment subdir components

🎯 Affected products26

  • Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:3c8a43dac72fcb80665579849150ce601046fbcf6c2306583b0490605115ac0f_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:693b5c635be68ad83f43140b36603d99a20c879bf345d12a44890b45bcd07b01_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:734219183920ce01e754291dd7611715a69a9403f9633b3400755786fcc275cd_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:8cbf69617323c8c5a34eb52591608ec28f43de129ed6140baf3f9a9a7fa483f8_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:1fd5ff140d8d559cfd3c5ba85036579e0e72fa4ce7125e16c1ea24d70e94ff86_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:46e186d49081b64a4291e49e5f2acd77184699b66cdc08acdbb7e82c259b2b74_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:86787f164505d6ef3917997ad7a424d65da313fe50f0f952f13f55ce9d798b99_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:bf1d68837cdb05f9c95e3c42692cc9e83fd4a0c5ac3dc7da3ffae49626502a9c_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:2a6694107707703209034473f159ab1f7e22106c7d1e1d722f373627dd9d7c47_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:5faebff2c06c92bbff9453f577c9b6c259e5365fb4f452f630c592e7a06673a2_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:8bec8dff7483dcb749deca1d7df6042b94d2a84abed4cf82e69230a8c28c59ca_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:9fa72261b4c4a178430ab10cecb79e1c9599740c3fc06192014245b1db1edffc_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:66d3a47929e31772f8cde153eb0523fb0f1696547ab2dbe98b30a453306b8adc_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:b00869deda7269236cb315b95c8abf4930b97995dcac9212a99b561251a401a9_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:b383628612ef6aff4328bd880b2400fd4011b53a1429a2ffacfc4d15f515d634_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:e86ddb9ffc3b50dc508f5eae310bcf1e7c994e7dbe3d538baebc1dc41316722d_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:3113f8ef93a2abecad7ad6bd44d800c9c2735888b93f7a9b713ee93669fc3802_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:5f9b2a458158fbf02a611d8d2822c6425d186ce4cd73c091a097a3c0218f18ff_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a2650c47f50206054063e8a62a8073d29a29808b21c2ab3d9964bd70995ff6eb_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:e33cee7e3c778713dd44e3109609155061de98b83fbb91a89182179163ec05d4_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:5931cffa333330d80fa57431080621e8f39cdb9257201fad7d56da31b01c569f_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:aea2066308c02465b7d1edc6afd52d3b6c37a92d1ca38e929a7354be2bb36493_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:b4339c9932dc7d84ce95f6b84a70f428f5f8da03e607f19602da5f83b6cacf1b_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:d37b966d871535c9277cda4c8aef1d9306b4f47f38043718ab4f13ccebbebc6b_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:c09e38353c9125431890b9cbd0be760b8b6c3d1faf6bb515e20c2c414dd70f2d_amd64 as a component of Red Hat OpenShift Service Mesh 3.0

✅ Remediation

See Red Hat OpenShift Service Mesh 3.0.10 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0 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. 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: To mitigate this vulnerability, avoid using untrusted BuildKit frontends. Restrict the use of custom BuildKit frontends to only those from verified and trusted sources. Do not specify untrusted frontends via `#syntax` or `--build-arg BUILDKIT_SYNTAX`.

🔗 References (12)