CVE-2026-42541— Kubewarden: RBAC Reconnaissance via unchecked can_i host capability call

Kubewarden: RBAC Reconnaissance via unchecked can_i host capability call

Kubewarden is a policy engine for Kubernetes. Prior to , An attacker with privileged AdmissionPolicy or AdmissionPolicyGroup create permissions (which isn't the default) can craft a policy that makes use of the can_i host callback. The callback issues a SubjectAccessReview (SAR) requests to enumerate RBAC permissions of any user or service account across the cluster. can_i does not perform that check to enforce the context-aware allow-list and forwards the request directly to the callback handler, which executes a real SubjectAccessReview using policy-server privileges. This creates a policy-level authorization gap: can_i is effectively usable even when the policy has no context-aware resource grant. This is an information disclosure / reconnaissance issue, and not direct workload data exfiltration. The attacker learns permission information, such as whether specific service accounts can "get secrets", "create pods", or "bind clusterroles" in chosen namespaces. This vulnerability is fixed in .

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

授权机制缺失

SUSE kubewarden 安全漏洞

SUSE kubewarden是德国SUSE公司的一个策略引擎。 SUSE kubewarden存在安全漏洞，该漏洞源于具有特权AdmissionPolicy或AdmissionPolicyGroup创建权限的攻击者可利用can_i主机回调，该回调直接执行SubjectAccessReview请求而不检查上下文感知允许列表，可能导致信息泄露和权限枚举。

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