Vulnerability Report

CVE-2026-40923

Title: Path Traversal in Tekton Pipelines VolumeMount

Arbitrary File Access

Proof Of Concept

No public PoC currently indexed for CVE-2026-40923.

CWE Category CWE-22

Published Date Apr 21, 2026

Modified Date May 22, 2026

Exploit Status Not Found

Score 5.4 CVSS v3.1

Exploit Probability (EPSS)

0.05%

Vulnerability Summary

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.

Impacted Vendors

linuxfoundation 1

Reference Links

https://github.com/tektoncd/pipeline/releases/tag/v1.11.1 https://github.com/tektoncd/pipeline/security/advisories/GHSA-rx35-6rhx-7858

CVSS v3.1

Source Entity [email protected]

Severity MEDIUM

5.4

Attack Vector

NETWORK

Complexity

LOW

Privileges

N/A

Interaction

NONE

Confidentiality

N/A

Integrity

N/A

Availability

N/A

Scope

UNCHANGED

RAW VECTOR CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Associated Attack Patterns (CAPEC)

Total: Patterns

CVE-2026-40923 Exploits & PoCs (Proof Of Concept)

No public PoCs found in our database for this CVE.

May 22, 2026 MODIFIED

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Attack Vector Matrix

Access Vector NETWORK

Complexity LOW

Privileges N/A

Interaction NONE

CVSS Vector String


                                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected Stack

No specific products linked.