Description
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.
Affected products
kyverno: kyverno
References4
- github.com/kyverno/kyverno/security/advisories/GHSA-fpjq-c37h-c… ExploitVendor Advisory
- github.com/kyverno/kyverno/security/advisories/GHSA-fpjq-c37h-c… ExploitVendor Advisory
- github.com/kyverno/kyverno/commit/76c8fdbe87328722e099e1fd44c3f… Patch
- github.com/kyverno/kyverno/commit/80e728c2283a0c65e5adb02d8a907… Patch
Metrics
- CVSS 3.1
-
7.7
HIGH
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H - EPSS — exploit probability
- 0% percentile: 31 · as of 13 November 2026
- CWE
- CWE-617
Could this be exploited in your environment?
A patch closes the known hole. A penetration test shows what an attacker can still reach — with proof.