CVE-2026-63121
Kubewarden trusted-repos-policy: uppercase registry host bypasses registry/image deny rules
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.
Fixes and workarounds
Fix
trusted-repos-policy (kubewarden): GitHub reports patched versions 2.1.2. Check the advisory for the affected release branch.
Source: GitHub GHSA-8p62-9vh2-272pAffected products and versions
| Product | Versions | Authority |
|---|---|---|
| policies kubewarden |
< 2.1.2 (affected) | CNA: GitHub_M |
trusted-repos-policytrusted-repos-policy
kubewarden |
2.1.1 (affected, GitHub advisory range) | GitHub GHSA-8p62-9vh2-272p |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 3.1 / 6.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L | CNA: GitHub_M |
| 3.1 / 6.3 medium |
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L | NVD: [email protected] |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272pCNA: GitHub_M · x_refsource_CONFIRM
- https://github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743dea41bCNA: GitHub_M · x_refsource_MISC
- https://github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2CNA: GitHub_M · x_refsource_MISC
- https://github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743dea41b[email protected]
- https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272p[email protected]
- https://github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2[email protected]
- https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272pGitHub Security Advisories · advisory
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