Kyverno is a policy engine designed for cloud native platform engineering teams. Prior to versions 1.17.2 and 1.16.4, an unchecked type assertion in the `forEach` mutation handler allows any user with permission to create a `Policy` or `ClusterPolicy` to crash the cluster-wide background controller into a persistent CrashLoopBackOff. The same bug also causes the admission controller to drop connections and block all matching resource operations.
The crash loop persists until the policy is deleted. The vulnerability is confined to the legacy engine, and CEL-based policies are unaffected. Versions 1.17.2 and 1.16.4 fix the issue.
Attack Parameters
Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
Weakness Type (CWE)
Vulnerable Products 2
| Configuration | From (including) | Up to (excluding) |
|---|---|---|
|
Kyverno Kyverno
cpe:2.3:a:kyverno:kyverno:*:-:*:*:*:*:*:*
|
1.13.0
|
1.16.4
|
|
Kyverno Kyverno
cpe:2.3:a:kyverno:kyverno:*:*:*:*:*:*:*:*
|
1.17.0
|
1.17.2
|
References 3
https://github.com/kyverno/kyverno/commit/76c8fdbe87328722e099e1fd44c3f21c9f780…
security-advisories@github.com
https://github.com/kyverno/kyverno/commit/80e728c2283a0c65e5adb02d8a907106e6ebe…
security-advisories@github.com
https://github.com/kyverno/kyverno/security/advisories/GHSA-fpjq-c37h-cqcv
security-advisories@github.com