CVE-2026-40923
Analyzed Analyzed - Analysis Complete
Path Traversal in Tekton Pipelines VolumeMount Allows Unauthorized Access

Publication date: 2026-04-21

Last updated on: 2026-05-22

Assigner: GitHub, Inc.

Description
Tekton Pipelines project provides k8s-style resources for declaring CI/CD-style pipelines. Starting in version 1.0.0 and prior to versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 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. Versions 1.0.2, 1.3.4, 1.6.2, 1.9.3, and 1.11.1 fix the issue.
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Meta Information
Published
2026-04-21
Last Modified
2026-05-22
Generated
2026-06-16
AI Q&A
2026-04-22
EPSS Evaluated
2026-06-14
NVD
CVE-2026-40923
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linuxfoundation tekton_pipelines to 1.11.1 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-22 The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
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Executive Summary

This vulnerability exists in the Tekton Pipelines project prior to version 1.11.1. It involves a validation bypass in the VolumeMount path restriction mechanism. Specifically, the system attempts to restrict mounting volumes under certain internal /tekton/ paths, but the validation uses a simple prefix check without properly cleaning the file path. This allows an attacker to use path traversal components like ".." to bypass the restriction. For example, a path such as /tekton/home/../results passes the validation check but actually resolves to /tekton/results at runtime, which is supposed to be restricted.

Impact Analysis

This vulnerability can allow an attacker with limited privileges to mount volumes in restricted internal paths within the Tekton Pipelines environment. This could lead to unauthorized access or modification of sensitive data stored in those paths. The impact includes potential information disclosure and integrity issues, as indicated by the CVSS score which reflects low complexity and limited privileges required, but with some confidentiality and integrity impact.

Mitigation Strategies

To mitigate this vulnerability, upgrade Tekton Pipelines to version 1.11.1 or later, where the validation bypass in the VolumeMount path restriction is fixed.

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