ESB-2026.4455 — Vulnetix

ESB-2026.4455 PUBLISHED CVSS 9.100000381469727 CRITICAL

=========================================================================== AUSCERT External Security Bulletin Redistribution ESB-2026.4455 OpenShift Container Platform 4.19.29 security and extras update 30 April 2026 =========================================================================== AUSCERT Security Bulletin Summary --------------------------------- Product: OpenShift Container Platform 4.19.29 Publisher: Red Hat Operating System: Red Hat Resolution: Patch/Upgrade CVE Names: CVE-2026-33186 Original Bulletin: https://access.redhat.com/errata/RHSA-2026:10094 Comment: CVSS (Max): 9.1 CVE-2026-33186 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N) CVSS Source: Red Hat Calculator: https://www.first.org/cvss/calculator/3.1#CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N EPSS (Max): 0.0% (5th) CVE-2026-33186 2026-04-28 - --------------------------BEGIN INCLUDED TEXT-------------------- RHSA-2026:10094 - Security Advisory Issued: 2026-04-29 Updated: 2026-04-29 Synopsis OpenShift Container Platform 4.19.29 security and extras update Type/Severity Security Advisory: Important Topic Red Hat OpenShift Container Platform release 4.19.29 is now available with updates to packages and images that fix several bugs. This release includes a security update for Red Hat OpenShift Container Platform 4.19. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section. Description 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 4.19.29. See the following advisory for the container images for this release: https://access.redhat.com/errata/RHSA-2026:10093 Security Fix(es): o google.golang.org/grpc/grpc-go: google.golang.org/grpc/authz: gRPC-Go: Authorization bypass due to improper HTTP/2 path validation (CVE-2026-33186) 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 4.19 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/openshift_container_platform/4.19/html-single/ updating_clusters/index#updating-cluster-cli. Solution 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/4.19/html /release_notes/ Details on how to access this content are available at https://docs.redhat.com/en/documentation/openshift_container_platform/4.19/ html-single/updating_clusters/index#updating-cluster-cli. Fixes o BZ - 2449833 CVEs o CVE-2026-33186 References o https://access.redhat.com/security/updates/classification/ - --------------------------END INCLUDED TEXT---------------------- You have received this e-mail bulletin as a result of your organisation's registration with AUSCERT. The mailing list you are subscribed to is maintained within your organisation, so if you do not wish to continue receiving these bulletins you should contact your local IT manager. If you do not know who that is, please send an email to auscert@auscert.org.au and we will forward your request to the appropriate person. NOTE: Third Party Rights This security bulletin is provided as a service to AUSCERT's members. As AUSCERT did not write the document quoted above, AUSCERT has had no control over its content. The decision to follow or act on information or advice contained in this security bulletin is the responsibility of each user or organisation, and should be considered in accordance with your organisation's site policies and procedures. AUSCERT takes no responsibility for consequences which may arise from following or acting on information or advice contained in this security bulletin. NOTE: This is only the original release of the security bulletin. It may not be updated when updates to the original are made. If downloading at a later date, it is recommended that the bulletin is retrieved directly from the author's website to ensure that the information is still current. Contact information for the authors of the original document is included in the Security Bulletin above. If you have any questions or need further information, please contact them directly. Previous advisories and external security bulletins can be retrieved from: https://portal.auscert.org.au/bulletins/ =========================================================================== AUSCERT The University of Queensland, Brisbane QLD 4072 Australia e: auscert@auscert.org.au t: +61 (0)7 3365 4417 Allies in Cyber Security ===========================================================================

Risk Scores

CVSS v3.1

9.100000381469727

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Affected Products

Vendor	Product	Versions
Red Hat	OpenShift Container Platform 4.19.29

Timeline

Apr 30, 2026 CVE Published
Apr 30, 2026 Distribution Patch

References

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