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.

CVSS v3 6.3 MEDIUM

6.3^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 2.8 / Impact : 3.4

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact LOW

Scope UNCHANGED

References

Link	Resource
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

Configurations

No configuration.

History

30 Oct 2026, 22:16

Type	Values Removed	Values Added
New CVE

Information

Published : 2026-10-30 22:16

Updated : 2026-10-30 22:16

NVD link : CVE-2026-63121

Mitre link : CVE-2026-63121

CVE.ORG link : CVE-2026-63121

JSON object : View

Products Affected

No product.

CWE

CWE-178

Improper Handling of Case Sensitivity

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