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CVE-2026-40923

Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

Published: Apr 21, 2026Updated: Apr 27, 2026 Sources: CVE List NVDCWE-22
NVD MITRE
5.4CVSSMEDIUM
EPSS Score
0.2%
Top 87.7%
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. Prior to 1.11.1, a validation bypass in the VolumeMount path restriction allows mounting volumes under restricted /tekton/ internal paths by using .. path traversal components. The restriction check uses strings.HasPrefix without filepath.Clean, so a path like /tekton/home/../results passes validation but resolves to /tekton/results at runtime. This vulnerability is fixed in 1.11.1.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:LI:LA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:LConfidentiality
Low
I:LIntegrity
Low
A:NAvailability
None
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Weaknesses

CWE-22

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

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/tektoncd/pipeline/releases/tag/v1.11.1
github.com
https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858
github.com

Timeline

Published
Apr 21, 2026
Last Updated
Apr 27, 2026

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