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

Quick assessment

Affected
kubewarden kubewarden-controller
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 4.3 · Medium EPSS 0.17% · P7

Affected Version Matrix 1

VendorProduct Version RangeStatus
kubewarden kubewarden-controller < 1.35.0 affected
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I. Basic Information for CVE-2026-42541

Vulnerability Information
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Vulnerability Title
Kubewarden: RBAC Reconnaissance via unchecked can_i host capability call
Source: CVE Program / CVE List V5
Vulnerability Description
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 .
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
Source: CVE Program / CVE List V5
Vulnerability Title
SUSE kubewarden 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
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。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
kubewarden kubewarden-controller < 1.35.0 -

II. Public POCs for CVE-2026-42541

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III. Intelligence Information for CVE-2026-42541

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Vendor Advisories for CVE-2026-42541 (1)

IV. Related Vulnerabilities

Same product: kubewarden-controller
Same vendor: kubewarden
Same weakness: CWE-862

V. Comments for CVE-2026-42541

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