RHSA-2026:60478: OpenShift Container Platform 4.21.31 security and extras update

Red Hat OpenShift Container Platform is Red Hat's cloud computing Kubernetes application platform solution designed for on-premise or private cloud deployments.This advisory contains the RPM packages for Red Hat OpenShift Container Platform 4.21.31. See the following advisory for the container images for this release:https://access.redhat.com/errata/RHSA-2026:60477 Security Fix(es): browserslist: Browserslist: Prototype pollution leading to denial of service (CVE-2026-73088) brace-expansion: Brace-expansion: Denial of Service via memory exhaustion in expand() function (CVE-2026-14257) brace-expansion: DoS via unbounded intermediate arrays, bypassing the CVE-2026-14257 mitigation (CVE-2026-69152) net/http/internal/http2: golang: golang.org/x/net: Go HTTP/2: Denial of Service via malformed SETTINGSMAXFRAMESIZE frame (CVE-2026-33814) js-yaml: js-yaml: Denial of Service via exponential parsing in flow collections (CVE-2026-73643) browserslist: Browserslist: Denial of Service via unbounded memory growth from distinct query results (CVE-2026-73089) For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.All OpenShift Container Platform 4.21 users are advised to upgrade to these updated packages and images when they are available in the appropriate release channel. To check for available updates, use the OpenShift CLI (oc) or web console. Instructions for upgrading a cluster are available at https://docs.redhat.com/en/documentation/openshiftcontainerplatform/4.21/html-single/updatingclusters/index#updating-cluster-cli.