CVE-2026-63121

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.

• CWE-178

• https://github.com/kubewarden/policies/commit/bc5597fcbbb0bc464b714ca7ff645c9743dea41b
• https://github.com/kubewarden/policies/security/advisories/GHSA-8p62-9vh2-272p
• https://github.com/kubewarden/policies/tree/trusted-repos-policy/v2.1.2

Published

Oct 30, 2026

Last Modified

Nov 5, 2026

Status

Awaiting Analysis

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