RHSA-2026:33150HighCVSS 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.3.5

Published
June 29, 2026
Last Modified
October 24, 2026

🔗 CVE IDs covered (4)

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

📋 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 3.3
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:33b95627674ae3c2c861b608ed1774eebf0fb935ac68252607a47f85d08b2e9e_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:80ec849e60eea36fac738606f21f7913b58c73adad65ea90f28c85322825d834_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:b49f1a001e39eda43e5663f883497795115033e4f9244ddfe2eb0157c108f8e4_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:c4540d0958efbefb455276b66e2eefc857c0a081f62ae5d2fedaca4194b54af5_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:2782bb9a9ef969484a11457d74cf601c269b40ee04443c9971dce2f3991f8f84_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:45bcc823540a2b4a733d5e62d21add913355757eb9fe7e98c3c0abe367ff0fce_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:500bdbe8258d40029f4b01cb59db71a631cd334601ba9398ac66b68fe13e7202_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:84ad0a9408aa3f3aafb2ee2cae236cba9099a348df038c70f4bc2612d752c21b_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:92457a690fbc08e28e12fd27a9496eb96d7ebaeb2d020c37b85aa6b9e4c118b0_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:b8296fd78c18bd81fb337551e3535a89ddef292673bb96e3aa7ea7934ebc8f04_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:d7af5398b0e60a6531627a2a58bde371e83448eed320a7965904a574d8e0b085_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:ef1aecb6e0f4e3adb6e402dd6c9ad67fbc1a2788f1e5beb6ccae325428780018_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:19b2d80d3968aa8dd004a5928b43ef741e62c1f5991923ac9d0e6a529264205c_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:9f5b9a1c78a9c66f4f1234b1dc5d5c607b08ca376a7fe5189ba30e3552797435_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:a6f021e3e71117be6d033874e5c84bca7e13beed284259bf2398e36759740e13_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:b526221d3897f33a9bf621c0f73d772d2982856b70bcbda107cf1a644b30562e_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:16e423afb75103bd669214d1b1290a518ce5fb6c892dec4146720bbcf83baa73_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:67d00b75ead6bae7ff671f10446f292a5db5437ff99e4d59635330de8ab7002c_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:ca2402ccdb16d77237bd8e60553dcac65f8345d70b5b20815039f954543713d7_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:ed825173015eac1018f157365defbac336f4d791ca5133e992abd17c9f153c67_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:e5045fa856fea16678dde8489381e393028a79dd23b2d479ada0396248eec546_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:402493b3158a8bb9e3fd173ebd101c404a68c7a07e5176a9b70fa3e7ee9c1187_s390x as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:6a851b3cd3c201a1e2a8ddea7c21fc1c7d5845fe73c0ca5b902a72a1585d2132_amd64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:c15c43a0719287a27aa75e3391e4e1fb96c1aa69e2982b34a0a98f99d23b6fd9_arm64 as a component of Red Hat OpenShift Service Mesh 3.3
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:f26bf9d900f0682660af10575c78fbb6aa7cf7bb8287f8aef4461e5add63409c_ppc64le as a component of Red Hat OpenShift Service Mesh 3.3

✅ Remediation

See Red Hat OpenShift Service Mesh 3.3.5 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.3 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)