medium5.4
CVE-2026-40923
Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check
Impact
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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/tektoncd/pipeline | >= 1.10.0, < 1.11.1 | 1.11.1 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linuxfoundation | Tekton Pipelines | before 1.11.1 |