CVE-2026-25542
Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 0.43.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1, trusted resources verification policies match a resource source string (refSource.URI) against spec.resources[].pattern using regexp.MatchString. In Go, regexp.MatchString reports a match if the pattern matches anywhere in the string, so common unanchored patterns (including examples in tekton documentation) can be bypassed by attacker-controlled source strings that contain the trusted pattern as a substring. This can cause an unintended policy match and change which verification mode/keys apply. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
- Affected
- tektoncd · pipeline
- CVSS v3.1 GITHUB
- 6.5 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N - EPSS
- 0.39% chance of exploitation in the next 30 days, 31st percentile
- Published
- 2026-04-21
- Updated
- 2026-05-22
Proof-of-concept exploits (1)
Security advisories
- tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr
- tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a