RHSA-2026:57802: OpenShift Container Platform 4.21.30 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 4.21.30. See the following advisory for the container images for this release:https://access.redhat.com/errata/RHSA-2026:57801 Security Fix(es): crypto/tls: golang: Go crypto/tls: Denial of Service via multiple TLS 1.3 key update messages (CVE-2026-32283) 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.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
OpenShift Container Platform 4.21to a version that resolves this vulnerability.Fixed in 4.21.30Patch RHSA-2026:57801 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch RHSA-2026:57801 - Compensating control
Check for available updates using the OpenShift CLI (oc) or the web console, and upgrade the cluster when the updated packages/images are available in the appropriate release channel.
Event History
Frequently Asked Questions
Which OpenShift deployments should be prioritized for this update?
All OpenShift Container Platform 4.21 users are advised to upgrade to the updated packages and images when they become available in the appropriate release channel. This advisory provides the RPM packages for version 4.21.30; the corresponding container images are covered by RHSA-2026:57801.
What capability does an attacker need to trigger the issue?
The issue is a denial of service in Go crypto/tls involving multiple TLS 1.3 key update messages. The advisory does not specify required access level, affected OpenShift components, or network exposure conditions.
How can administrators check for and apply the update?
Use the OpenShift CLI (oc) or the web console to check for available updates. Upgrade both the updated RPM packages from this advisory and the corresponding release container images when available.