Description
Kyverno before 1.19.2 contains a denial of service vulnerability that allows namespace-scoped policy authors to exhaust CPU and memory by submitting CEL expressions evaluated without runtime cost limits. Attackers can create a NamespacedValidatingPolicy or NamespacedDeletingPolicy with nested map comprehensions over large ConfigMap fields to OOM-kill Kyverno pods and block cluster-wide admission.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| kyverno | kyverno | < 1.19.2 | 1.19.2 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Wolfi
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Wolfi rolling | kyverno-1.17 +1 | No fix yet | — |
Advisories 1
- WID-SEC-2026-4096 Kyverno: Mehrere Schwachstellen BSI CERT-Bund (WID) · Nov 4, 2026
References
- GitHub Security Advisory (GHSA-m8p2-qqmx-j53x) vendor-advisory
- VulnCheck Advisory: Kyverno before 1.19.2 Denial of Service via Unbounded CEL Policy Evaluation Cost third-party-advisory