Resource exhaustion in Kyverno
CVE-2026-122309
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.
Vulnerability class: DoS (Denial of Service)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 6.2 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:N/I:N/A:H.
EPSS exploit prediction
EPSS: 0.002 (9.5th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 9th percentile — 9.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
The 30-day trend appears once there are two daily scores.
Affected products
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-m8p2-qqmx-j53x (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-before-1.19.2-denial-of-service-via-unboun… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122309?
- CVE-2026-122309 is a medium-severity vulnerability in Kyverno, classified under Uncontrolled Resource Consumption. CVSS score: 6.2/10. Published 2026-11-05.
- How severe is CVE-2026-122309?
- Medium severity. CVSS v3 base score is 6.2 out of 10.