# CVE-2026-25542

## Summary

- **CVE ID:** CVE-2026-25542
- **Severity:** MEDIUM
- **CVSS Score:** 6.5 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N)
- **CWE:** CWE-185
- **Published:** Apr 21, 2026
- **Last Modified:** May 22, 2026

## Description

Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. From 0.43.0 to 1.11.0, 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.

## Affected Products

- tektoncd — pipeline (>= 0.43.0, <= 1.11.0)
- tektoncd — pipeline (>= 0.43.0, < 1.0.2)
- tektoncd — pipeline (>= 1.2.0, < 1.3.4)
- tektoncd — pipeline (>= 1.4.0, < 1.6.2)
- tektoncd — pipeline (>= 1.7.0, < 1.9.3)
- tektoncd — pipeline (>= 1.10.0, < 1.11.1)

## References

- [CNA](https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr)
- [CNA](https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.26%
- **EPSS Percentile:** 18.2

---
_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._