{"id":"GHSA-4w7w-66w2-5vf9","summary":"Vite Vulnerable to Path Traversal in Optimized Deps `.map` Handling","details":"### Summary\n\nAny files ending with `.map` even out side the project can be returned to the browser.\n\n### Impact\n\nOnly apps that match the following conditions are affected:\n\n- explicitly exposes the Vite dev server to the network (using `--host` or [`server.host` config option](https://vitejs.dev/config/server-options.html#server-host))\n- have a sensitive content in files ending with `.map` and the path is predictable\n\n### Details\n\nIn Vite v7.3.1, the dev server’s handling of `.map` requests for optimized dependencies resolves file paths and calls `readFile` without restricting `../` segments in the URL. As a result, it is possible to bypass the [`server.fs.strict`](https://vite.dev/config/server-options#server-fs-strict) allow list and retrieve `.map` files located outside the project root, provided they can be parsed as valid source map JSON.\n\n### PoC\n1. Create a minimal PoC sourcemap outside the project root\n    ```bash\n    cat \u003e /tmp/poc.map \u003c\u003c'EOF'\n    {\"version\":3,\"file\":\"x.js\",\"sources\":[],\"names\":[],\"mappings\":\"\"}\n    EOF\n    ```\n2. Start the Vite dev server (example)\n    ```bash\n    pnpm -C playground/fs-serve dev --host 127.0.0.1 --port 18080\n    ```\n3. Confirm that direct `/@fs` access is blocked by `strict` (returns 403)\n    \u003cimg width=\"4004\" height=\"1038\" alt=\"image\" src=\"https://github.com/user-attachments/assets/15a859a8-1dc6-4105-8d58-80527c0dd9ab\" /\u003e\n4. Inject `../` segments under the optimized deps `.map` URL prefix to reach `/tmp/poc.map`\n    \u003cimg width=\"2790\" height=\"846\" alt=\"image\" src=\"https://github.com/user-attachments/assets/5d02957d-2e6a-4c45-9819-3f024e0e81f2\" /\u003e","aliases":["CVE-2026-39365"],"modified":"2026-07-17T21:09:08.534191077Z","published":"2026-04-06T18:03:46Z","database_specific":{"github_reviewed_at":"2026-04-06T18:03:46Z","nvd_published_at":"2026-04-07T20:16:30Z","cwe_ids":["CWE-200","CWE-22"],"severity":"MODERATE","github_reviewed":true},"references":[{"type":"WEB","url":"https://github.com/vitejs/vite/security/advisories/GHSA-4w7w-66w2-5vf9"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-39365"},{"type":"WEB","url":"https://github.com/vitejs/vite/pull/22161"},{"type":"WEB","url":"https://github.com/vitejs/vite/commit/79f002f2286c03c88c7b74c511c7f9fc6dc46694"},{"type":"PACKAGE","url":"https://github.com/vitejs/vite"},{"type":"WEB","url":"https://github.com/vitejs/vite/releases/tag/v6.4.2"},{"type":"WEB","url":"https://github.com/vitejs/vite/releases/tag/v7.3.2"},{"type":"WEB","url":"https://github.com/vitejs/vite/releases/tag/v8.0.5"}],"affected":[{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"8.0.0"},{"fixed":"8.0.5"}]}],"database_specific":{"source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4w7w-66w2-5vf9/GHSA-4w7w-66w2-5vf9.json","last_known_affected_version_range":"\u003c= 8.0.4"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"7.0.0"},{"fixed":"7.3.2"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 7.3.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4w7w-66w2-5vf9/GHSA-4w7w-66w2-5vf9.json"}},{"package":{"name":"vite","ecosystem":"npm","purl":"pkg:npm/vite"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"6.4.2"}]}],"database_specific":{"last_known_affected_version_range":"\u003c= 6.4.1","source":"https://github.com/github/advisory-database/blob/main/advisories/github-reviewed/2026/04/GHSA-4w7w-66w2-5vf9/GHSA-4w7w-66w2-5vf9.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"}]}