Vulnerability in Kyverno
CVE-2026-122321
Kyverno 1.18.0 before 1.19.2 contains a signature verification bypass in verifyImages because cached verification results are keyed by the image reference string (such as a tag) rather than bound to the verified digest, so cache hits skip signature and attestation checks. An attacker who can submit workloads and move a registry tag can warm the cache with a signed image, repoint the tag, and have Kyverno admit the workload and use mutateDigest to pin the unverified digest.
Vulnerability class: TOCTOU (Time-of-Check to Time-of-Use)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:H/A:L.
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-2r43-6962-xcw5 (vendor-advisory)
- www.vulncheck.com/advisories/kyverno-1.18.0-before-1.19.2-verifyimages-cache-si… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-122321?
- CVE-2026-122321 is a critical-severity vulnerability in Kyverno, classified under Time-of-check Time-of-use (TOCTOU) Race Condition. CVSS score: 9.1/10. Published 2026-11-05.
- How severe is CVE-2026-122321?
- Critical severity. CVSS v3 base score is 9.1 out of 10.