Privilege escalation in Kyverno
CVE-2026-122313
Kyverno from 1.17.0 before 1.19.2 contains a privilege escalation vulnerability that allows namespace-scoped tenants to modify resources in other namespaces through NamespacedMutatingPolicy targetMatchConstraints.expression CEL output lacking namespace checks. Attackers can emit a literal target such as another tenant's RoleBinding, which the cluster-wide background controller then mutates to add attacker subjects or alter Roles, NetworkPolicies, and ConfigMaps.
Vulnerability class: Privilege Escalation
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-f96w-622v-rqpq (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-1.17.0-before-1.19.2-cross-namespace-privi… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122313?
- CVE-2026-122313 is a critical-severity vulnerability in Kyverno, classified under Improper Privilege Management. CVSS score: 9.9/10. Published 2026-11-05.
- How severe is CVE-2026-122313?
- Critical severity. CVSS v3 base score is 9.9 out of 10.