RHSA-2026:54500HighCVSS 7.5

Red Hat Security Advisory: OpenShift Compliance Operator bug fix and enhancement update

Published
August 13, 2026
Last Modified
August 18, 2026

🔗 CVE IDs covered (3)

CVE-2026-27145 →CVE-2026-33811 →CVE-2026-42504 →

📋 Description

CVE-2026-27145 — crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries CVE-2026-33811 — net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME CVE-2026-42504 — mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header

🎯 Affected products18

  • OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-content-rhel8@sha256:0e92582024f42a1e8836b6e5bd0e8125c4f90345019febb01aef3fc3d18819eb_ppc64le as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-content-rhel8@sha256:3abf963f35712afd8fe476e32b1f9f3318b0e1d84f5d6e31059fa439baed2afd_arm64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-content-rhel8@sha256:8823d451e5cc3925e0b3b08f62ae44db0b98ed616f2bc12a34a21055245fac26_amd64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-content-rhel8@sha256:a9831e3a9099684b681fe9db5ee3319b5694aaa2e18728bc1f5f646843b4593a_s390x as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-must-gather-rhel8@sha256:52ec7d078b31a8b8c4a465414ffc9f3071f05d31d7463c008520606ea0e5eba2_s390x as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-must-gather-rhel8@sha256:533549b13f642dae060e2f280d1e95fd74e614629323207e7072555d44f741cb_arm64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-must-gather-rhel8@sha256:5c8a3c4145373a8692dafef3a2c4d7d234833f0cf088d835a27d4d6047f38c81_amd64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-must-gather-rhel8@sha256:a01373b1502c4422ac2d749b349128cbe474c8ebe9259bd16531a010e80cc499_ppc64le as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-openscap-rhel8@sha256:10920bf717fb38a7b6e3f30605b4f21f27e7263304b4aee2b2f54c65c875b823_amd64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-openscap-rhel8@sha256:74009399da69bf6e4cf73acd8dab59e75a9113d3445731e3278e2c4f532448e9_arm64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-openscap-rhel8@sha256:88163c2079ef72fc3d4d862b0ee00e67b5daed69efea36c1add970c86fec098b_ppc64le as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-openscap-rhel8@sha256:ab42a8cf28e8d99b1a00236c2f3b135bc410d0b923d9da6d82bc8f9fb0983d55_s390x as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-operator-bundle@sha256:bfe946d2878a37624641a92ed538c77861c355fb4a44a387944d988feca7ca95_amd64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-rhel8-operator@sha256:3680c7063c60ba00998a6bfdf4598d7938e365eb9e736be7ce369df04489d987_ppc64le as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-rhel8-operator@sha256:971ded98dfecc78d23a4e6cf3370918b3293c1fae1098f7bf1f97437895b9b79_arm64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-rhel8-operator@sha256:c240c2c93f0ecec98896bec956beb5b50deb8e5d20792cbcbe055e76b7587de1_amd64 as a component of OpenShift Compliance Operator 1
  • registry.redhat.io/compliance/openshift-compliance-rhel8-operator@sha256:d5ef91916dfe6d39b74ffaa8e21eaf681580668616ecfda2aabe7feec7b0a8e1_s390x as a component of OpenShift Compliance Operator 1

✅ Remediation

Before applying this update, make sure all previously released errata relevant to your system have been applied. For details on how to apply this update, refer to: https://docs.openshift.com/container-platform/latest/updating/updating_a_cluster/updating-cluster-cli.html Workaround: A flaw was found in the Go standard library crypto/x509 package. When verifying a TLS certificate hostname, VerifyHostname processed each DNS Subject Alternative Name (SAN) entry in a loop and repeatedly split the candidate hostname on "." characters. For certificates with a very large DNS SAN list, CPU use could grow quadratically with the number of SAN entries and hostname labels. Because hostname verification runs before the certificate chain is built, this overhead can occur even when the certificate is not trusted. Red Hat rates this issue as Important. It affects Red Hat products that include the Go standard library crypto/x509 code from an affected Go toolchain version (before Go 1.25.11, or from Go 1.26.0 through Go 1.26.3). Applications and container images built with a fixed Go release (1.25.11 or later, or 1.26.4 or later) are not affected. Community distributions such as Fedora are also affected. Upstream fix: Go 1.25.11 and Go 1.26.4 (GO-2026-5037). 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: To mitigate this issue, restrict network access to services that process MIME headers from untrusted sources. Implement input validation and sanitization for all incoming data, especially MIME headers, to prevent maliciously crafted content from being processed by applications utilizing the vulnerable Golang MIME package.

🔗 References (6)