Tekton Pipelines: VerificationPolicy regex pattern bypass via substring matching

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2026-25542
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-21 17:16:24 UTC
Updated2026-05-01 16:33:50 UTC
DescriptionTekton 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.

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: 0.000390000 probability, percentile 0.119830000 (date 2026-05-28)

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Linuxfoundation Tekton Pipelines All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Tektoncd Pipeline affected >= 0.43.0, < 1.0.2 Not specified
CNA Tektoncd Pipeline affected >= 1.2.0, < 1.3.4 Not specified
CNA Tektoncd Pipeline affected >= 1.4.0, < 1.6.2 Not specified
CNA Tektoncd Pipeline affected >= 1.7.0, < 1.9.3 Not specified
CNA Tektoncd Pipeline affected >= 1.10.0, < 1.11.1 Not specified

References

ReferenceSourceLinkTags
github.com/tektoncd/pipeline/security/advisories/GHSA-rmx9-2pp3-xhcr [email protected] github.com Exploit, Vendor Advisory
github.com/tektoncd/pipeline/commit/b8905600322aa86327baae0a7c04d6cf1207... [email protected] github.com Patch
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report