Red Hat Security Advisory: OpenShift Container Platform 4.21.19 bug fix and security 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 container images for Red Hat OpenShift Container Platform 4.21.19. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:23239 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/
AI Analysis
Technical Summary
This advisory covers the release of Red Hat OpenShift Container Platform 4.21.19, which contains security updates addressing three CVEs: CVE-2026-1784, CVE-2026-33186, and CVE-2026-34986. The update includes fixes for bugs and enhancements in container images and RPM packages. The vulnerabilities relate to issues categorized under CWE-15 (External Control of System or Configuration Setting), CWE-551 (Improper Restriction of Operations within the Bounds of a Memory Buffer), and CWE-131 (Incorrect Calculation of Buffer Size). The advisory does not provide detailed CVSS scores but rates the overall security impact as Important. The vendor provides updated container images and RPM packages, and instructions for upgrading clusters are available in the official documentation. There are no known exploits in the wild at the time of this advisory.
Potential Impact
The vulnerabilities addressed in this update have been rated by Red Hat Product Security as having an Important security impact. The issues involve potential risks related to system configuration control and memory buffer handling, which could affect the stability and security of OpenShift Container Platform deployments. No known exploits in the wild have been reported. The update mitigates these risks by providing patched container images and packages.
Mitigation Recommendations
Red Hat has released updated container images and RPM packages as part of OpenShift Container Platform 4.21.19 to address these vulnerabilities. Users are advised to upgrade their OpenShift Container Platform 4.21 clusters to this release using the official upgrade procedures documented by Red Hat. The vendor manages remediation through these updates; no additional mitigation steps are indicated beyond applying the update. Patch status is confirmed by the vendor advisory.
Red Hat Security Advisory: OpenShift Container Platform 4.21.19 bug fix and security update
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 container images for Red Hat OpenShift Container Platform 4.21.19. See the following advisory for the RPM packages for this release: https://access.redhat.com/errata/RHBA-2026:23239 Space precludes documenting all of the container images in this advisory. See the following Release Notes documentation, which will be updated shortly for this release, for details about these changes: https://docs.redhat.com/en/documentation/openshift_container_platform/4.21/html/release_notes/
CVSS v3.1
Affected software
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This advisory covers the release of Red Hat OpenShift Container Platform 4.21.19, which contains security updates addressing three CVEs: CVE-2026-1784, CVE-2026-33186, and CVE-2026-34986. The update includes fixes for bugs and enhancements in container images and RPM packages. The vulnerabilities relate to issues categorized under CWE-15 (External Control of System or Configuration Setting), CWE-551 (Improper Restriction of Operations within the Bounds of a Memory Buffer), and CWE-131 (Incorrect Calculation of Buffer Size). The advisory does not provide detailed CVSS scores but rates the overall security impact as Important. The vendor provides updated container images and RPM packages, and instructions for upgrading clusters are available in the official documentation. There are no known exploits in the wild at the time of this advisory.
Potential Impact
The vulnerabilities addressed in this update have been rated by Red Hat Product Security as having an Important security impact. The issues involve potential risks related to system configuration control and memory buffer handling, which could affect the stability and security of OpenShift Container Platform deployments. No known exploits in the wild have been reported. The update mitigates these risks by providing patched container images and packages.
Mitigation Recommendations
Red Hat has released updated container images and RPM packages as part of OpenShift Container Platform 4.21.19 to address these vulnerabilities. Users are advised to upgrade their OpenShift Container Platform 4.21 clusters to this release using the official upgrade procedures documented by Red Hat. The vendor manages remediation through these updates; no additional mitigation steps are indicated beyond applying the update. Patch status is confirmed by the vendor advisory.
Technical Details
- Gcve Source
- db.gcve.eu
- Csaf Category
- csaf_security_advisory
- Csaf Version
- 2.0
- Publisher
- Red Hat Product Security
- Advisory Id
- RHSA-2026:23241
- Cve Count
- 3
- Additional Cves
- ["CVE-2026-33186","CVE-2026-34986"]
- Cvss Version
- null
Threat ID: 6a2abb30815e7002b8ea1970
Added to database: 6/11/2026, 1:42:08 PM
Last enriched: 6/11/2026, 1:45:14 PM
Last updated: 6/11/2026, 4:54:28 PM
Views: 7
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