RHSA-2026:70645HighCVSS 8.2

Red Hat Security Advisory: OpenShift Container Platform 4.12.99 packages and security update

Published
October 1, 2026
Last Modified
October 5, 2026

🔗 CVE IDs covered (7)

CVE-2026-56862 →CVE-2026-27145 →CVE-2026-33818 →CVE-2026-39821 →CVE-2026-42504 →CVE-2026-56859 →CVE-2026-56860 →

📋 Description

CVE-2026-27145 — crypto/x509: golang: golang crypto/x509: Denial of Service via excessive processing of DNS SAN entries CVE-2026-33818 — encoding/asn1: golang: Go encoding/asn1: Denial of Service via excessive recursion in Unmarshal CVE-2026-39821 — golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing CVE-2026-42504 — mime: golang: Golang MIME: Denial of Service via maliciously-crafted MIME header CVE-2026-56859 — encoding/xml: golang: Go: Denial of Service via XML decoding recursion depth issue CVE-2026-56860 — net/url: golang: golang net/url: Denial of Service from quadratic complexity in path resolution CVE-2026-56862 — crypto/tls: golang: Golang crypto/tls: Denial of Service via indefinite KeyUpdate messages

🎯 Affected products75

  • Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-37.rhaos4.12.git2e7f657.el8.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-37.rhaos4.12.git2e7f657.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-37.rhaos4.12.git2e7f657.el8.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-37.rhaos4.12.git2e7f657.el8.src as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-37.rhaos4.12.git2e7f657.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-8.rhaos4.12.git6120b13.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-8.rhaos4.12.git6120b13.el9.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-8.rhaos4.12.git6120b13.el9.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-8.rhaos4.12.git6120b13.el9.src as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-0:1.25.5-8.rhaos4.12.git6120b13.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-37.rhaos4.12.git2e7f657.el8.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-37.rhaos4.12.git2e7f657.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-37.rhaos4.12.git2e7f657.el8.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-37.rhaos4.12.git2e7f657.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-8.rhaos4.12.git6120b13.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-8.rhaos4.12.git6120b13.el9.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-8.rhaos4.12.git6120b13.el9.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debuginfo-0:1.25.5-8.rhaos4.12.git6120b13.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-37.rhaos4.12.git2e7f657.el8.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-37.rhaos4.12.git2e7f657.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-37.rhaos4.12.git2e7f657.el8.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-37.rhaos4.12.git2e7f657.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-8.rhaos4.12.git6120b13.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-8.rhaos4.12.git6120b13.el9.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-8.rhaos4.12.git6120b13.el9.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • cri-o-debugsource-0:1.25.5-8.rhaos4.12.git6120b13.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-tools-0:1.25.0-7.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.12
  • cri-tools-0:1.25.0-7.el9.ppc64le as a component of Red Hat OpenShift Container Platform 4.12
  • cri-tools-0:1.25.0-7.el9.s390x as a component of Red Hat OpenShift Container Platform 4.12
  • +45 more not shown

✅ Remediation

For OpenShift Container Platform 4.12 see the following documentation, which will be updated shortly for this release, for important instructions on how to upgrade your cluster and fully apply this asynchronous errata update: https://docs.redhat.com/en/documentation/openshift_container_platform/4.12/html/release_notes 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: Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds. 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. 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 (10)