CVE-2026-47429: Improper Limitation of a Pathname to a Restricted Directory

Vitest is a testing framework powered by Vite. Prior to 3.2.5 and 4.1.0, the Vitest UI/API server on Windows used isFileServingAllowed incorrectly for /vitestattachment, allowing \?\..\ path traversal to read files outside the project; exposed API write and rerun features such as saveTestFile...