Medium 6.5Published Apr 21, 2026

CVE-2026-25542Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

Updated under an hour ago (Oct 29, 2026, 6:40 PM ET)

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No exploitation reported and no EPSS estimate yet.

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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.

CVSS: 6.5 MEDIUM (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Weakness (CWE): CWE-185
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: GitHub_M
NVD analysis: Modified
Record last updated: May 22, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

tektoncd pipeline tektoncd:pipeline (from the name)	from 0.43.0, < 1.0.2; from 1.2.0, < 1.3.4; from 1.4.0, < 1.6.2; from 1.7.0, < 1.9.3; from 1.10.0, < 1.11.1	CNA record
linuxfoundation tekton_pipelines linuxfoundation:tekton_pipelines	from 0.43.0 before 1.11.0	NVD

References

References

https://github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr	x-refsource-confirm, exploit, vendor-advisory
https://github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207362a	x-refsource-misc, patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.