CVE-2026-63121
Dashboard / Vulnerabilities / CVE-2026-63121
Summary: Kubewarden trusted-repos-policy: uppercase registry host bypasses registry/image deny rules
Details: 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.
References: https://github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/63xxx/CVE-2026-63121.json, https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272p, https://nvd.nist.gov/vuln/detail/CVE-2026-63121, https://github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743dea41b
Affected packages
Package
Name:
Purl:
