RHSA-2026:54584: OpenShift Container Platform 4.20.34 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 4.20.34. See the following advisory for the container images for this release:https://access.redhat.com/errata/RHSA-2026:54583 Security Fix(es): golang.org/x/crypto/ssh: golang.org/x/crypto/ssh: Denial of Service via crafted AES-GCM packet decoder inputs (CVE-2026-46597) js-yaml: js-yaml: Denial of Service via crafted YAML documents (CVE-2026-59869) net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME (CVE-2026-33811) 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 4.20 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/4.20/html-single/updatingclusters/index#updating-cluster-cli.
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade
OpenShift Container Platformto a version that resolves this vulnerability.Fixed in 4.20.34Patch RHSA-2026:54583 - Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Patch RHSA-2026:54583 - Compensating control
Check for available updates for OpenShift Container Platform 4.20.34 using the OpenShift CLI (oc) or the web console, then upgrade via the appropriate release channel as directed.
Event History
Frequently Asked Questions
Which OpenShift deployments should be updated?
All OpenShift Container Platform 4.20 users are advised to upgrade to the updated packages and images when they become available through the appropriate release channel.
What types of attacks do the listed fixes address?
The advisory addresses denial-of-service issues in the Go SSH package through crafted AES-GCM packet decoder inputs, in js-yaml through crafted YAML documents, and in Go's net package through a long CNAME response processed by LookupCNAME.
How can an administrator check whether the update is available?
Use the OpenShift CLI (oc) or the web console to check for available updates.
Does applying the RPM update also cover the release container images?
No. The advisory states that the container images for this release are provided in a separate advisory, RHSA-2026:54583.