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CVE-2026-112949

4.7 · MEDIUM

Vitest is a Vite-native testing framework for JavaScript and TypeScript projects.

Published Oct 20, 2026CWE-94EPSS 0.34%

Overview

CVE-2026-112949 is a medium-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/vitest-dev/vitest/commit/15cc006aa9f8683dc5f7e895d011fa7dc751ce35GitHubgithub.com/vitest-dev/vitest/commit/b825313243dc55757e8d7c0f9e7a792135e13473GitHubgithub.com/vitest-dev/vitest/releases/tag/v4.1.12GitHubgithub.com/vitest-dev/vitest/releases/tag/v5.0.3GitHubgithub.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8GitHubgithub.com/vitest-dev/vitest/security/advisories/GHSA-qxg6-89mg-rqv8

How CyberStrike helps

Frequently asked questions

What is CVE-2026-112949?

CVE-2026-112949 is a medium-severity vulnerability. It was published on October 20, 2026 and has a CVSS 3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2026-112949?

This vulnerability has a CVSS 3.1 base score of 4.7, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-112949?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-112949?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-112949 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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