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Vulnerability · Published Apr 21, 2026 · Assigned by GitHub_M

CVE-2026-40923Tekton Pipelines: VolumeMount path restriction bypass via missing filepath.Clean in /tekton/ check

Medium 5.4

In plain English

A medium-severity path traversal in pipeline from tektoncd. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)0.2%top 87.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Gogithub.com/tektoncd/pipeline1.11.1GHSA-rx35-6rhx-7858
Gogithub.com/tektoncd/pipeline1.9.3GHSA-rx35-6rhx-7858
Gogithub.com/tektoncd/pipeline1.6.2GHSA-rx35-6rhx-7858
Gogithub.com/tektoncd/pipeline1.3.4GHSA-rx35-6rhx-7858
Gogithub.com/tektoncd/pipeline1.0.2GHSA-rx35-6rhx-7858
Gogithub.com/tektoncd/pipeline1.0.2, 1.11.1, 1.3.4, 1.6.2, 1.9.3GO-2026-5643

Affected products (as reported)

VendorProductVersions
tektoncd pipeline >= 1.0.0, < 1.0.2>= 1.2.0, < 1.3.4>= 1.4.0, < 1.6.2>= 1.7.0, < 1.9.3>= 1.10.0, < 1.11.1

Weakness: CWE-22 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

References