CVE-2026-40923
Path Traversal in Tekton Pipelines VolumeMount Allows Unauthorized Access
Publication date: 2026-04-21
Last updated on: 2026-04-27
Assigner: GitHub, Inc.
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| linuxfoundation | tekton_pipelines | to 1.11.1 (exc) |
Helpful Resources
Exploitability
| 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. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
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.
How can this vulnerability impact me? :
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.
What immediate steps should I take to mitigate this vulnerability?
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.