RHSA-2026:34788: Important: OpenShift Container Platform 4.20.28 bug fix and security update

Red Hat OpenShift Container Platform is Red Hat's cloud computingKubernetes application platform solution designed for on-premise or privatecloud deployments.Space precludes documenting all of the container images in this advisory.See the following Release Notes documentation, which will be updatedshortly for this release, for details about these changes:https://docs.redhat.com/en/documentation/openshiftcontainerplatform/4.20/html/releasenotes/ Security Fix(es): gnutls: gnutls: Denial of Service via DTLS packet reordering vulnerability (CVE-2026-42009) gnutls: gnutls: Authentication Bypass via NUL Character in Username (CVE-2026-42010) kernel: Linux kernel: smb: client: reject userspace cifs.spnego descriptions (CVE-2026-46243)For more details about the security issue(s), including the impact, a CVSSscore, acknowledgments, and other related information, refer to the CVEpage(s) listed in the References section.All OpenShift Container Platform 4.20 users are advised to upgrade to theseupdated packages and images when they are available in the appropriaterelease channel. To check for available updates, use the OpenShift CLI (oc)or web console. Instructions for upgrading a cluster are available athttps://docs.redhat.com/en/documentation/openshiftcontainerplatform/4.20/html-single/updatingclusters/index#updating-cluster-cli.

— Red Hat