CVE-2026-29773
MEDIUM
GHSA-6r7f-3fwq-hq74
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Lifecycle Timeline
3Description
Kubewarden is a policy engine for Kubernetes. Kubewarden cluster operators can grant permissions to users to deploy namespaced AdmissionPolicies and AdmissionPolicyGroups in their Namespaces. One of Kubewarden promises is that configured users can deploy namespaced policies in a safe manner, without privilege escalation. An attacker with privileged "AdmissionPolicy" create permissions (which isn't the default) could make use of 3 deprecated host-callback APIs: kubernetes/ingresses, kubernetes/namespaces, kubernetes/services. The attacker can craft a policy that exercises these deprecated API calls and would allow them read access to Ingresses, Namespaces, and Services resources respectively. This attack is read-only, there is no write capability and no access to Secrets, ConfigMaps, or other resource types beyond these three.
Analysis
Kubewarden's deprecated host-callback APIs in AdmissionPolicy can be exploited by authenticated users with policy creation permissions to gain unauthorized read access to cluster-level resources including Ingresses, Namespaces, and Services. An attacker with privileged AdmissionPolicy creation permissions—not a default privilege—could craft malicious policies to bypass intended access controls and enumerate sensitive cluster infrastructure, though this vulnerability is limited to read-only access without write capability or access to Secrets and ConfigMaps. …
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Remediation
Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.
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