---
id: CVE-2026-122318
title: Kyverno before 1.19.2 Cosign Identity Check Bypass via Empty SAN Certificates
summary: >-
  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 f…
severity: high
cvss: 7.7
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:L/I:H/A:L'
cvssSource: cna
cwe:
  - CWE-295
vendor: kyverno
product: kyverno
affected:
  - kyverno < 1.19.2
published: '2026-11-05'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T02:25:17.874Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-122318'
references:
  - url: 'https://github.com/kyverno/kyverno/security/advisories/GHSA-fcfr-fr8g-qjqv'
    label: GitHub Security Advisory (GHSA-fcfr-fr8g-qjqv)
  - url: >-
      https://www.vulncheck.com/advisories/kyverno-before-1.19.2-cosign-identity-check-bypass-via-empty-san-certificates
    label: >-
      VulnCheck Advisory: Kyverno before 1.19.2 Cosign Identity Check Bypass via
      Empty SAN Certificates
tags:
  - cve.org
ingestedAt: '2026-11-05T21:36:00.690Z'
---

## Overview

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.

## Affected

- `kyverno < 1.19.2`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.