CVE-2026-122318 Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates

What is CVE-2026-122318?

CVE-2026-122318 is a high-severity vulnerability in kyverno, published on 5 Nov 2026.

Official description

Kyverno before 1.19.2 contains an authentication bypass in matchCertificateData that skips verifyImages subject and subjectRegExp checks when the signing certificate has no Subject Alternative Name. Attackers holding a leaf certificate from a configured private trust root can omit the SAN, set the expected Fulcio issuer OID, and sign malicious images that are admitted despite signer pinning.

Weakness: CWE-295

Which versions are affected by CVE-2026-122318?

It affects 1 product.

Products include Kyverno.

How do I fix CVE-2026-122318?

No fix has been published for CVE-2026-122318 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-122318 being exploited?

There is no known exploitation of CVE-2026-122318 in the wild and no public exploit code.

Other vulnerabilities in kyverno

• CVE-2026-22039 Kyverno Cross-Namespace Privilege Escalation via Policy apiCall Critical 10.0
• CVE-2026-4789 CVE-2026-4789 Critical 9.8
• CVE-2026-122303 Kyverno 1.17.0 before 1.19.2 Cross-Namespace Resource Overwrite via NamespacedMutatingPolicy Critical 9.4
• CVE-2026-122304 Kyverno 1.17.0 before 1.19.2 Privilege Escalation via CleanupPolicy Context Loader Critical 9.4
• CVE-2026-122310 Kyverno 1.19.1 before 1.19.2 Privilege Escalation via Policy apiCall urlPath Critical 9.4

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• GitHub advisory
• How this page is made

Also known as GHSA-fcfr-fr8g-qjqv, GHSA-p8fx-8mgf-mvw3.