RHSA-2026:33142HighCVSS 7.5

Red Hat Security Advisory: Red Hat OpenShift Service Mesh 3.2.7

Published
June 29, 2026
Last Modified
October 21, 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 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:6361c72a416f9c526cb8bd5302a09576ecb42783b5463373b4e1a156a853e7c7_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:9f1288a84d733a35b614799b089d7387eb531d93a74a6c3c000050f25c02e118_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:ddbadeeccbdf5d5790fe0b0d1f73c20a076c78abf4a3b772cb3a659da1cb498e_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-cni-rhel9@sha256:e846c7a3249d9adde4fe726ea014a9baeda40ac77682956d2eb7a7d0b98d44b2_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:532913386d1d87491af0103aaa5864f7a6c49b1102b797d3ee1abf9fdd30f6af_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:654aaa8fed47874eab09983497f3e8ca68c585f1d571b7cb16e74456d0507a1b_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:7c8176fdbaa174d3e63d19a1b3ff87265b933222001b93e48c727b803e57cf65_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-must-gather-rhel9@sha256:c489a0307f63b00c751076a2094965e6abb4156ab699fe6f7a3cacba4a21584c_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:2c856d274a80d96a0baf6637fb8d80de3c8ab4b33e81dd0010f8ba2322dde6e2_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:52faa002893296c093bb9a54b83fdb32e0ff51bbec06cea798eb90fe6c3ef248_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:61a9860dfcda26edb8b93c43f21c9e02e2d3cd77b38796be02757df310bb8ac5_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-pilot-rhel9@sha256:76b3c3919d3568cc0d89f7c856ed8a2375e30a31d7a951b9f314c13b832b1f7d_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:009aeda3bde6e5594ba93e4fbf40c6016847e7b43662a6116a27525a3156053e_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:11c730544a9bb63c8904584852b72258e72d27490f7e3d81563de58472dda1a9_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:ad1307ea51df6499586f5bca6f199eba0ed210c0c92cb956dc369c260bc2365f_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-proxyv2-rhel9@sha256:d7701c740d3dfd0a09779d16959d6f152f833e0412e596b814a1aa59fe786375_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:4daa21ee08d85e5e730e2b58505921432b0dea68d9070657c0056dad1a811cad_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:70b467c190151f56fb06e8f1dcf310df9df814c7385bcfd445f7fba632a67a02_s390x as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:e2631180cdd17b45eada7b7bc819a11820c579e99f752591ba436738cbc68e65_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-rhel9-operator@sha256:fc1ade41eb326612cfb20663acc42544138b26aa139b0c34672f7a41913ab772_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-sail-operator-bundle@sha256:cbd159ca7efa82158770d4d2c77ef594f3abe09eb15af211af310183b70e0b39_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:3e87bd8143a3c855ff49c81de4659f1543778ba14c84cde5be25c266ad9f662a_amd64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:e4112975c38998a87442a638362137ae09e1d37ff5223646c0e1b5d0fa23f35b_ppc64le as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:f91bcf707e6e9124f82b85349909a34b95feacaa429b9b7c56e78c391f87211d_arm64 as a component of Red Hat OpenShift Service Mesh 3.2
  • registry.redhat.io/openshift-service-mesh/istio-ztunnel-rhel9@sha256:fab818bf0fb122eddbf2180491168661a70c709f6aaaaf3fac78595d0cc0a13e_s390x as a component of Red Hat OpenShift Service Mesh 3.2

✅ Remediation

See Red Hat OpenShift Service Mesh 3.2.7 documentation at https://docs.redhat.com/en/documentation/red_hat_openshift_service_mesh/3.2 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)