Path Traversal in Kyverno
CVE-2026-122311
Kyverno from 1.16.0 before 1.19.2 fails to validate path segments in the resource argument of resource.get() and resource.post(), allowing namespaced CEL policies to escape their namespace. Tenants who can create a NamespacedValidatingPolicy can insert .. segments to read and write arbitrary cluster objects using the admission controller's ServiceAccount, leading to cluster takeover.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.9 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/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
Weakness classification (CWE)
References
- github.com/kyverno/kyverno/security/advisories/GHSA-4pqm-wqq6-h9q2 (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-1.16.0-before-1.19.2-path-traversal-in-nam… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122311?
- CVE-2026-122311 is a critical-severity vulnerability in Kyverno, classified under Path Traversal. CVSS score: 9.9/10. Published 2026-11-05.
- How severe is CVE-2026-122311?
- Critical severity. CVSS v3 base score is 9.9 out of 10.