CVE-2026-122318
Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates
CVSS Score
7.7
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-295 |
| Vendor | kyverno |
| Product | kyverno |
| Published | Nov 5, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:L Attack Vector
Network
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
High
Availability
Low
Affected Versions
kyverno / kyverno
0 < 1.19.2
References
Credits
arpitjain099