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CVE-2026-25542

Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

Published: Apr 21, 2026Updated: May 1, 2026 Sources: CVE List NVDCWE-185
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.3%
Top 82.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-185

Affected Products

tekton pipelineslinuxfoundation
Mixed
AI / ML / ml-framework
pipelinetektoncd
On-prem
DevTools & CI / ci-cd
linuxfoundationoss-projectUSAI / MLaka yocto, pytorch, everest
tektoncdoss-projectDevTools & CIaka tekton cd, tekton-cd

Exploitability

Official Patch Available

References

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

Timeline

Published
Apr 21, 2026
Last Updated
May 1, 2026

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