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.

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 2026-11-05 · last modified 2026-11-05.

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

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Kyverno

Weakness classification (CWE)

CWE-400 — Uncontrolled Resource Consumption

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)

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.