Vulnerability Description
Kubewarden policies is a collection of WebAssembly policies for securing and governing Kubernetes clusters. For versions provisionally classified as affected before 2.1.2, `trusted-repos-policy` compares an image's `registry` hostname against `reject lists` and `allow lists` case-sensitively even though `registry` DNS names are case-insensitive. An image with an uppercase or mixed-case `registry` hostname can miss a rejection rule for the equivalent lowercase host, so the admission policy accepts a resource whose container runtime pulls the same prohibited image. Only reject-list configurations have this bypass: allow-list configurations fail closed by over-denying differently cased hostnames. The security consequences depend on the configured rejection policy and deployment environment. This issue is fixed in version 2.1.2.
CVSS Score
MEDIUM
Related Weaknesses (CWE)
References
- https://github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743
- https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272p
- https://github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2
FAQ
What is CVE-2026-63121?
CVE-2026-63121 is a vulnerability with a CVSS score of 6.3 (MEDIUM). Kubewarden policies is a collection of WebAssembly policies for securing and governing Kubernetes clusters. For versions provisionally classified as affected before 2.1.2, `trusted-repos-policy` compa...
How severe is CVE-2026-63121?
CVE-2026-63121 has been rated MEDIUM with a CVSS base score of 6.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-63121?
Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.