Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

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Summary

CVECVE-2026-25542
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-21 17:16:24 UTC
Updated2026-04-22 21:24:26 UTC
DescriptionTekton 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.

Risk And Classification

Primary CVSS: v3.1 6.5 MEDIUM from [email protected]

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

EPSS: 0.000290000 probability, percentile 0.082110000 (date 2026-04-22)

Problem Types: CWE-185 | CWE-185 CWE-185: Incorrect Regular Expression

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
3.1CNADECLARED6.5MEDIUMCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tektoncd Pipeline affected >= 0.43.0, <= 1.11.0 Not specified

References

ReferenceSourceLinkTags
github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr [email protected] github.com
github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207... [email protected] github.com
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