RHSA-2026:33120HighCVSS 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.0.13

Published
June 29, 2026
Last Modified
October 13, 2026

🔗 CVE IDs covered (4)

CVE-2026-33811 →CVE-2026-33814 →CVE-2026-39820 →CVE-2026-42499 →

📋 Description

CVE-2026-33811 — net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME CVE-2026-33814 — net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGS_MAX_FRAME_SIZE frame CVE-2026-39820 — net/mail: golang: Go net/mail: Denial of Service via crafted email inputs CVE-2026-42499 — net/mail: golang: net/mail: Denial of Service via pathological email address parsing

🎯 Affected products26

  • Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:5fdcc9c7b6ff9b4b099713c4d549128c12b335fb0c28154f631ba3e9f99c8f52_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh-dev-preview-beta/istio-ztunnel-rhel9@sha256:c1e04b361c355bb1d5f44a57dc041158eef59eb83f831a4d6413b00298af79d2_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:c77f3dcf9aef74e532505742c538ae46e3eb569cd72398736d476dba197aa1ed_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:ec5f07a3b10e44e9300eb7d62cfc0d1d31833ab72c12f5815ff0542b81624b7c_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:42493d19383ead956b26476cc20dfa6c328bbdb5a4f40ba5be32f8f87ede33d4_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:4d80beaa628f568236255e1970ffcfff668ee23faf97f532e881b0025f98111d_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:b994454b076fda08a36d4d949545d6d80229c9345a00f59d04ccbab41ef54066_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:bb734ae567ad77fd92f44c3d226055055a8c990b8123db23386149f418e68f04_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:0dbe0cdb02314a8a78dca02557441f9b99ab3bcd93157c17dbbb81f5cbc8eb81_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:a6f4f1a5fa8fa84fd7850e17dfbe1837ea35fe636385f3dfcd63a3ecb975b410_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:e71fa71c7203561946e9f0038eaad69957c9717b34abc60fcd4044e1f64417b3_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:ee26949de4dce15bc35847d8f361c507fb852d9f006eaabd07a344f3c56856f9_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:30e125ba97b545946ce958d62acfa95a095baecae5dfa80a44617a44e22633e8_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:a1c134048c73b0ba902974f0515938902de93b0c3b32f0cc91fb8a6f45706629_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:bdf16979b6650d9016b07c0dfab4b75e727234755a7c0d9beb1230c98d313dff_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:f473fa7b227648c66af6f54c728d8b42af3ceb1dcfca21c295f2e2af36dd31b7_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:138e739ebd61c7b1b47f0056d7b9a889a6368529e7fca3cb755c7b40be65df2c_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:5d92ddc988d165e8e2b66e017a8cbd1ac1ee7fc91caaacec62bfcedce1c3f2b3_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:919e44a19dafe3670f6431be3aa01bf7bfebfdeacac5c3882cd9c8e2e4905516_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:e24864eb5b3285151c6a59f9f35a097467458ff21f0831be5178d3f74910b822_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:38ca5e774bac8287a27dc4af5b4f015fa1a3e2bcc1618c97e642a5ff4ab66982_ppc64le as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:6d607b4aac9562b1401b33c9dc4d496ec13c75d765bf426e11bcf4fa5769a056_amd64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:70dc18e5444c2ebc7c0b77740d0083de9d4e139f45e59292ae1edd48a518d8af_s390x as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:e1644b7694bf252a2e220773f811e5ae7f83c2c0c1885ff7c3a2f471cab33ed1_arm64 as a component of Red Hat OpenShift Service Mesh 3.0
  • registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:19ead4f64970ea27823756dd4e0e55215c8787c4d5d923cde8e4c8345dc013c5_amd64 as a component of Red Hat OpenShift Service Mesh 3.0

✅ Remediation

See Red Hat OpenShift Service Mesh 3.0.13 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.0 Workaround: To mitigate this issue, applications can be configured to use the pure Go DNS resolver instead of the `cgo` DNS resolver. This can be achieved by setting the `GODEBUG` environment variable to `netdns=go`. For example, to run a Go application with this mitigation: `GODEBUG=netdns=go /path/to/your/go/application`. This change may require restarting affected applications or services to take effect. Users should verify that this change does not negatively impact DNS resolution for their specific application environment. 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 (7)