{"id":"CVE-2026-112946","aliases":["GHSA-rq7h-c2jc-7f22"],"url":"https://o3.security/vulnerability/CVE-2026-112946","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```","published":"2026-10-20T15:03:55.196Z","modified":"2026-10-24T02:49:28.994783002Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"vite","fixedVersion":"8.3.3"},{"ecosystem":"npm","name":"vite","fixedVersion":"8.2.4"},{"ecosystem":"npm","name":"vite","fixedVersion":"8.1.6"},{"ecosystem":"npm","name":"vite","fixedVersion":"7.3.7"},{"ecosystem":"npm","name":"vite","fixedVersion":"6.4.4"},{"ecosystem":"npm","name":"vite-plus","fixedVersion":"1.1.0"}],"fix":{"url":"https://github.com/vitejs/vite/commit/170b92791421bcd484f7325936d989a82d6bd4aa","label":"vitejs/vite@170b927"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/112xxx/CVE-2026-112946.json"},{"type":"ADVISORY","url":"https://github.com/vitejs/vite/security/advisories/GHSA-rq7h-c2jc-7f22"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-112946"},{"type":"FIX","url":"https://github.com/vitejs/vite/commit/170b92791421bcd484f7325936d989a82d6bd4aa"},{"type":"FIX","url":"https://github.com/vitejs/vite/commit/45c0e3392a298626955a0ab93a8e51232daac721"},{"type":"FIX","url":"https://github.com/vitejs/vite/commit/c3e06f92e969952466b4e2f5801e85e1e00cd905"},{"type":"FIX","url":"https://github.com/vitejs/vite/commit/e570d8d016096b5f8f6f09808376ca6cf73f27d0"},{"type":"FIX","url":"https://github.com/vitejs/vite/commit/f0d76c7da13d5e794807b82f0b86c1931a8438e3"},{"type":"FIX","url":"https://github.com/vitejs/vite/pull/23656"},{"type":"PACKAGE","url":"https://github.com/vitejs/vite"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T02:49:28.994783002Z"}}