Vulnerability Report

CVE-2026-25542

Title: Regular Expression Bypass in Tekton Pipelines Trusted Resources Verification

Other

Proof Of Concept

No public PoC currently indexed for CVE-2026-25542.

CWE Category CWE-185

Published Date Apr 21, 2026

Modified Date May 22, 2026

Exploit Status Not Found

Score 6.5 CVSS v3.1

Exploit Probability (EPSS)

0.04%

Vulnerability Summary

CVE-2026-25542: 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.

Impacted Vendors

linuxfoundation 1

Reference Links

https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

6.5

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-25542 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

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Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Affected Stack

No specific products linked.