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.