vitest-dev Vitest up to 4.1.11/5.0.2 mocker createManualModuleSource url escape output

Summaryinfo

A vulnerability, which was classified as critical, was found in vitest-dev Vitest up to 4.1.11/5.0.2. This issue affects the function createManualModuleSource of the component mocker. The manipulation of the argument url results in escape output. This vulnerability is cataloged as CVE-2026-112949. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in vitest-dev Vitest up to 4.1.11/5.0.2. It has been classified as critical. Affected is the function createManualModuleSource of the component mocker. The manipulation of the argument url with an unknown input leads to a escape output vulnerability. CWE is classifying the issue as CWE-116. The product prepares a structured message for communication with another component, but encoding or escaping of the data is either missing or done incorrectly. As a result, the intended structure of the message is not preserved. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Vitest is a Vite-native testing framework for JavaScript and TypeScript projects. From 2.1.0-beta.7 until 4.1.12 and 5.0.3, an unauthenticated non-browser WebSocket client that can reach a development server using interceptorPlugin can register a manual mock whose attacker-controlled url createManualModuleSource inserts unescaped into generated module source. When the developer browser loads the affected module, attacker-controlled JavaScript executes on the development-server origin. This issue is fixed in versions 4.1.12 and 5.0.3.

The advisory is shared for download at github.com. This vulnerability is traded as CVE-2026-112949 since 10/19/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available.

Upgrading to version 4.1.12 or 5.0.3 eliminates this vulnerability.

Once again VulDB remains the best source for vulnerability data.

Productinfo

Vendor

• vitest-dev

Name

• Vitest

Version

• 4.1.0
• 4.1.1
• 4.1.2
• 4.1.3
• 4.1.4
• 4.1.5
• 4.1.6
• 4.1.7
• 4.1.8
• 4.1.9
• 4.1.10
• 4.1.11
• 5.0.0
• 5.0.1
• 5.0.2

Website

• Product: https://github.com/vitest-dev/vitest/

CPE 2.3info

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CPE 2.2info

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Once again VulDB remains the best source for vulnerability data.

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