CVE-2026-112950

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Path Traversal in Vitest Testing Framework

Publication date: 2026-10-20

Last updated on: 2026-10-28

Assigner: GitHub, Inc.

Description

Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 4.1.11 until 4.1.12 and 5.0.3, isFileLoadingAllowed and the filesystem read interpret backslashes differently on Windows in packages/mocker/src/node/interceptorPlugin.ts. When a client can reach the Vite dev server on Windows and register a redirect mock containing backslash traversal, POSIX joining preserves a Windows backslash traversal that the later filesystem read interprets as a path separator, so the client can read a file outside server.fs.allow that the Vitest process can access. This issue is fixed in versions 4.1.12 and 5.0.3.

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Meta Information

Published

2026-10-20

Last Modified

2026-10-28

Generated

2026-11-09

AI Q&A

2026-10-20

EPSS Evaluated

2026-11-08

NVD

CVE-2026-112950

EUVD

EUVD-2026-105152

Affected Vendors & Products

Vendor	Product	Version / Range
vitest-dev	vitest	>= 4.1.11, < 4.1.12
vitest-dev	vitest	>= 5.0.0-rc.2, < 5.0.3
@vitest	mocker	>= 4.1.11, < 4.1.12
@vitest	mocker	>= 5.0.0-rc.2, < 5.0.3

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-22	The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.

Attack-Flow Graph

Executive Summary

This vulnerability is a path traversal bypass in the @vitest/mocker package for Windows systems. It occurs due to inconsistent path normalization between POSIX and Windows. Attackers can register a redirect with a backslash in the URL, which bypasses allowlist checks because POSIX path joining does not normalize backslashes. The filesystem later interprets these backslashes as path separators, allowing unauthorized file reads outside the restricted directory.

Detection Guidance

To detect this vulnerability, inspect Vitest server logs for unusual file access attempts or WebSocket registration with backslash traversal in URLs. Check for files accessed outside the configured root directory. No specific commands are provided in the context.

Impact Analysis

If you run a Vite dev server on Windows using Vitest versions between 4.1.11-4.1.12 or 5.0.0-5.0.2, an attacker with network access could exploit this to read files outside the server's allowed directory. This could expose sensitive data like configuration files or source code.

Compliance Impact

This vulnerability allows unauthorized file reads outside restricted directories on Windows systems, which could lead to exposure of sensitive data. For GDPR, this may violate principles of data minimization and security. For HIPAA, it could compromise protected health information if accessed without authorization.

Mitigation Strategies

Upgrade @vitest/mocker to version 4.1.12 or 5.0.3 or later. If using affected versions, restrict network access to the Vite dev server and monitor file access logs for suspicious activity.

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