RHSA-2026:9453HighCVSS 9.1

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.4

Published
April 21, 2026
Last Modified
July 27, 2026

🔗 CVE IDs covered (5)

CVE-2026-25679 →CVE-2026-33186 →CVE-2026-33747 →CVE-2026-33748 →CVE-2026-34986 →

📋 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 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 products26

  • Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:1aa2834ce676ef21f5a67e3144fe62677d9bf7b57a9401d74fab7cf569da9911_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4d39ae3b09ef2ee139705831bff3f9070d2590d59887a488bfdbb36b590dec13_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4f5e7e28f111429e2c9376ac5f42d717f13eea1c3a80357fe001a9caf5c25fba_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:727908a49c6edf57609ac8a75d5aab182a79530e88819ea8a1df8a9610826c02_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:284458d236e45ffa8a865917bf6253764dbe0f6602173ba3f6733b0a40c5a741_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:2b6f5aa276fe5848c6f377c51be574045b04ea784374bcb54e496f2a297f02b0_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:5b95c5cfc63958a16f3b30a42f16b9ff26b2f2c9f8e3c539fcec75b721edfb88_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:c592a7d2b6b5997972ed7a2deda29c5e9bb03c2b28e42d1f6f57ae1639629c11_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:193b36cc5bc389b68c6e8080e1d47c3860aab22f7a4ee262c90b864967e23a97_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:31e020f606b687b82712fe32823a392ed1abcc9563845ea81fbfce616b99e6b1_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:7e688abcea40cae3f552b2dc5abf0da092e8a0d7a3f04f3cb5d15c5b4fb1a1f2_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:8111afc971379ee93fef9ebddfccf75102309c134d25f9d6d3de46f59e809001_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:3e210dcd0cab9c18bc0629a3a20b27e75bc09c09decbfcc9f6ab69f7c29670e1_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:9d1e9ff2ab9a3f84328cdbe49d4263d34e9ef1ef14d689a32d87534d7631cb0d_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a2904680a45ff398adce27c1cbc539bf08e7f53aa64fadf0d6db74f1296421ad_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:f62ae2005f3c153975695253d786a00a1a5827b92f96328a0be425fdd4125e69_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:3f1d2206dea7630015fac80f8b8c6f7a6a1e1c17e477d1d54db4690b4453e6a0_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:6015e887371eed1bd162363ebd16ca4f20bd8077df166b455685579e808a9292_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:87953048140227569e7028187ed92cc0960bbc055d62a6755c5a1fdcf10510ec_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:dfb94112b66ce7fe56a642371749bf87e979b0136652328b124cc384818ef6c3_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:615f4ab167e82d54f5cd9bea15e0673293ec42bf19cfa0ccc15eb1d20b7db18a_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:56140955dffe7c205dc944835637f83f04c5a82ba6f192dcfb034aa9cf800f8f_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:62b18afbdedf572866fd0dca6aa9e2426608d0b1cf011acef9f9044f4fbe4711_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:74b244e23b80d7996138a01814de1cb9d679ce7ed4156b5521fd76efc1bb5db5_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:cf5b5c9c6ba78281d0080d426f71c5b7b3e2b46db3644d153862268c0b4bf538_amd64 as a component of Red Hat OpenShift Service Mesh 3.2

✅ Remediation

See Red Hat OpenShift Service Mesh 3.2.4 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.2 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 (14)