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CVE-2026-122318Kyverno 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.
7.2 HIGHEPSS 0.17%Not in KEVNVD: Undergoing Analysis
Overview
Severity
| Score | Severity | Version | Vector String |
|---|---|---|---|
| 7.2 | HIGH | 4.0VulnCheck (CNA) | 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 |
| 7.7 | HIGH | 3.1VulnCheck (CNA) | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:L |
Details
- CVE ID
- CVE-2026-122318
- Status
- Undergoing Analysis
- Assigner (CNA)
- VulnCheck
- Published
- Nov 5, 2026
- Last modified
- 2026-11-05 14:58 UTC
- Weaknesses
- CWE-295 · Improper Certificate Validation
Affected Products
As published by the CNA in the CVE record.
kyvernokyverno1 version range
- before 1.19.2