CVE-2026-40923
Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check
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.
INFO
Published Date :
April 21, 2026, 9:16 p.m.
Last Modified :
April 27, 2026, 6:07 p.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | MEDIUM | [email protected] |
Solution
- Update Tekton Pipelines to version 1.11.1.
- Apply version 1.11.1 or newer.
- Ensure path restrictions are properly validated.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-40923.
| URL | Resource |
|---|---|
| https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 | Release Notes |
| https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-40923 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-40923
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-40923 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-40923 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Apr. 27, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:a:linuxfoundation:tekton_pipelines:*:*:*:*:*:go:*:* versions up to (excluding) 1.11.1 Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 Types: Release Notes Added Reference Type GitHub, Inc.: https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858 Types: Vendor Advisory -
New CVE Received by [email protected]
Apr. 21, 2026
Action Type Old Value New Value Added 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. Added CVSS V3.1 AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N Added CWE CWE-22 Added Reference https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 Added Reference https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858