CVE-2026-40923

MEDIUM

Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

Title source: cna
STIX 2.1

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.

References (2)

Core 2
Core References

Scores

CVSS v3 5.4
EPSS 0.0022
EPSS Percentile 12.4%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-22
Status published
Products (12)
linuxfoundation/tekton_pipelines < 1.11.1
tektoncd/pipeline 1.0.0 - 1.0.2Go
tektoncd/pipeline 1.10.0 - 1.11.1Go
tektoncd/pipeline 1.2.0 - 1.3.4Go
tektoncd/pipeline 1.4.0 - 1.6.2Go
tektoncd/pipeline 1.7.0 - 1.9.3Go
tektoncd/pipeline < 1.11.1
tektoncd/pipeline >= 1.0.0, < 1.0.2
tektoncd/pipeline >= 1.10.0, < 1.11.1
tektoncd/pipeline >= 1.2.0, < 1.3.4
... and 2 more
Published Apr 21, 2026
Tracked Since Apr 22, 2026