CVE-2026-122318
Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates
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.
Fixes and workarounds
No remediation reported in collected sources.
Missing remediation information is not evidence that no patch exists.
Affected products and versions
| Product | Versions | Authority |
|---|---|---|
| kyverno kyverno github.com/kyverno/kyverno
golang |
≥ 0; < 1.19.2 (affected, semver) 1.19.2 (unaffected, semver) Other versions: unaffected |
CNA: VulnCheck |
Version ranges are source assertions. Check the vendor advisory and your installed configuration before determining exposure.
CVSS assessments
| Version / score | Vector | Authority |
|---|---|---|
| 4.0 / 7.2 high |
CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:L/VI:H/VA:L/SC:L/SI:H/SA:L | CNA: VulnCheck |
| 3.1 / 7.7 high |
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:L | CNA: VulnCheck |
Exploit evidence
No exploit evidence in collected sources. This is not proof of no exploitation.
References
- https://github.com/kyverno/kyverno/security/advisories/GHSA-fcfr-fr8g-qjqvCNA: VulnCheck · vendor-advisory
- https://www.vulncheck.com/advisories/kyverno-before-1.19.2-cosign-identity-check-bypass-via-empty-san-certificatesCNA: VulnCheck · third-party-advisory
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