RHSA-2026:54580HighCVSS 8.2

Red Hat Security Advisory: OpenShift Container Platform 4.20.34 packages and security update

Published
August 18, 2026
Last Modified
August 18, 2026

🔗 CVE IDs covered (1)

CVE-2026-39821 →

📋 Description

CVE-2026-39821 — golang.org/x/net/idna: golang: net/http: golang.org/x/net/idna: Privilege escalation via incorrect Punycode label processing

🎯 Affected products13

  • Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.aarch64 as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.ppc64le as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.s390x as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.src as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.aarch64 as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.ppc64le as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.s390x as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.src as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-redistributable-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el8.x86_64 as a component of Red Hat OpenShift Container Platform 4.20
  • openshift-clients-redistributable-0:4.20.0-202608101541.p2.g1367d50.assembly.stream.el9.x86_64 as a component of Red Hat OpenShift Container Platform 4.20

✅ Remediation

For OpenShift Container Platform 4.20 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/4.20/html/release_notes/ Workaround: Upgrade to a fixed golang.org/x/net release that includes the idna correction, via updated golang or dependent package rebuilds.

🔗 References (4)