{"schema":"threatline.record/2","record":{"id":"CVE-2026-112946","aliases":["GHSA-rq7h-c2jc-7f22"],"summary":"Vite: Files outside `server.fs.allow` could be served when project paths match system paths on non-Windows machine","details":"### Summary\n\nThe content of files outside `server.fs` setting can be returned to the browser if the project imports a file path concatenated with the `root`. For example, if the project references `<path-to-project-root>/etc/hosts`, the content of `/etc/hosts` was possible to be returned.\n\nThe content of files outside the `server.fs.allow` option can be returned to the browser when a project imports a file whose root-relative path matches an absolute path on the host. For example, referencing `<project-root>/etc/hosts` could make Vite return the host's `/etc/hosts` file.\n\n### Impact\n\nOnly apps that meet all of the following conditions are affected:\n\n- explicitly expose the Vite dev server to the network (using `--host` or the [`server.host` option](https://vite.dev/config/server-options#server-host))\n- contain an imported file whose root-relative browser URL is also the absolute path of a readable file on the host\n- The sensitive file is not matched by [`server.fs.deny`](https://vite.dev/config/server-options#server-fs-deny)\n- the dev server is not running on Windows\n\n### Details\n\nWhen Vite analyzes an in-root import, it rewrites the resolved module ID to a browser URL such as `/etc/hostname`. In affected versions, Vite converts that URL with `fsPathFromUrl` and adds the result to `safeModulePaths`. Because `fsPathFromUrl` ensures a leading slash without resolving the URL against the project root, the project URL `/etc/hostname` is recorded as if it were the absolute filesystem path `/etc/hostname`.\n\nFor a later request to `/@fs/etc/hostname`, the raw-filesystem middleware interprets `/etc/hostname` as an absolute path. The access check applies `server.fs.deny`, then accepts paths present in `safeModulePaths` before checking `server.fs.allow`. As a result, the request can return the host file instead of the project file that originally populated `safeModulePaths`.\n\n### PoC\nThe following example requires Linux with a readable `/etc/hostname`:\n```bash\n$ mkdir vite-safe-module-path-poc\n$ cd vite-safe-module-path-poc\n$ npm init -y\n$ npm install vite@8.3.1\n$ mkdir -p etc\n$ echo 'PROJECT-DECOY\\n' > etc/hostname\n$ echo 'import \"./etc/hostname\"\\n' > main.js\n$ npx vite --host 127.0.0.1\n```\n\nIn another terminal:\n```bash\n$ curl -o /dev/null -s -w '%{http_code}\\n' http://127.0.0.1:5173/main.js\n200\n$ curl -sS -o response -w '%{http_code}\\n' http://127.0.0.1:5173/@fs/etc/hostname\n200\n$ cmp -s response /etc/hostname && echo 'response matches host file'\nresponse matches host file\n```","categories":["Libraries & packages"],"product":"vite","vendor":"vitejs","ecosystem":"npm","affected_ranges":[{"source":"GitHub Advisory 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