Path Traversal in Linuxfoundation Tekton Pipelines
CVE-2026-40923
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.
Vulnerability class: Path Traversal (Directory Traversal)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (23.3th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 23.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Linuxfoundation Tekton Pipelines
- Tektoncd Pipeline — versions >= 1.4.0, < 1.6.2, >= 1.2.0, < 1.3.4, >= 1.7.0, < 1.9.3
Weakness classification (CWE)
References
- github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858 (Vendor Advisory)
- github.com/tektoncd/pipeline/releases/tag/v1.11.1 (Release Notes)
Frequently asked questions
- What is CVE-2026-40923?
- CVE-2026-40923 is a medium-severity vulnerability in Linuxfoundation Tekton Pipelines, classified under Path Traversal. CVSS score: 5.4/10. Published 2026-04-21.
- How severe is CVE-2026-40923?
- Medium severity. CVSS v3 base score is 5.4 out of 10.