CVE-2026-112947

CVE-2026-112947 · Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Vite is a frontend tooling framework for JavaScript. From 8.2.0 until 8.2.4 and 8.3.3, the first 4 bytes of files outside of server.fs setting can be returned to the browser by a request containing ?vite-wasm-instance. Requests containing the ?vite-wasm-instance query are handled by the internal Wasm plugin's load hook. The hook removes the query and reads the resulting path directly from disk, but the server.fs checks were not applied. After reading the file, Vite attempts to parse it as WebAssembly. When that parse fails, Node and deno throws an error that contains the first 4 bytes of the file. This vulnerability is fixed in 8.2.4 and 8.3.3.

CVSS 6.3 · Medium · EPSS 0.5% · Public exploit · Fix available

Published

2026-10-20T15:10:51.025Z

Updated

2026-10-21T15:54:49.530Z

Stack: node

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