Red Hat Security Advisory: OpenShift Container Platform 4.21.3 bug fix and security update
Affects Red HatSource GCVE Database
Not known to be exploited · fixed in Red Hat package updates : patch Red Hat soon.
Data as of 1 Nov 2026, 08:20 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 1.8% chance of exploitation in 30 days – higher than 78% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 4.21.3
Exploitation evidence
Disclosed: evidence found.
CVE published 24 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 31 Oct 2026.
What to do
AI-suggested
Users of Red Hat OpenShift Container Platform 4.21 should upgrade to version 4.21.3, which contains the security fixes and bug updates. The vendor provides updated container images and RPM packages. Follow the official upgrade instructions in the Red Hat documentation to fully apply the asynchronous errata update. No additional mitigation steps are indicated beyond applying the update.
Description
Red Hat OpenShift Container Platform 4.21.3 includes a security update addressing several bugs and enhancements. This update is rated as having an important security impact and is intended for on-premise or private cloud Kubernetes deployments. Users of OpenShift Container Platform 4.21 are advised to upgrade to the updated packages and container images to apply the security fixes.