{"id":"GHSA-vfpm-58rq-9qcg","revision":"75e1882225244b70bca6dd917df67549","records":[{"revision":"75e1882225244b70bca6dd917df67549","observedAt":"2026-10-24T13:17:17.793+00:00","statement":{"source":"osv","id":"GHSA-vfpm-58rq-9qcg","aliases":["CVE-2026-112947"],"title":"Vite: First 4 bytes of files outside of `server.fs` setting is exposed by `?vite-wasm-instance`","description":"### Summary\n\nThe first 4 bytes of files outside of `server.fs` setting can be returned to the browser by a request containing `?vite-wasm-instance`.\n\n### Impact\n\n Only apps that match one of the following conditions are affected:\n\n- explicitly expose the Vite dev server to the network using `--host` or the [`server.host`](https://vite.dev/config/server-options#server-host) option\n- there's a file that has a sensitive information in **the first 4 bytes**\n- uses Node.js or Deno to run Vite (if Bun is used, it is not affected)\n\n### Details\nRequests 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.\n\nAfter 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.\n\n### PoC\n\nCreate a denied file and start an affected Vite dev server:\n\n```bash\necho 'SECRET_KEY=abc123\\n' > .env\nnpm run dev\ncurl 'http://localhost:5173/.env?vite-wasm-instance'\n```\n\nThis will show\n```\nFailed to parse WASM file \"<root>/.env\": WebAssembly.compile(): expected magic word 00 61 73 6d, found 53 45 43 52 @+0\n```","state":0,"publishedAt":"2026-10-21T16:47:15+00:00","modifiedAt":"2026-10-21T17:00:07.4434678+00:00","affected":[{"ecosystem":"npm","name":"vite","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"8.3.0"},{"kind":"fixed","version":"8.3.3"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"vite","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"8.2.0"},{"kind":"fixed","version":"8.2.4"}]}],"versions":[],"rawVersionEvidence":null},{"ecosystem":"npm","name":"vite-plus","ranges":[{"type":"SEMVER","events":[{"kind":"introduced","version":"0.2.8"},{"kind":"fixed","version":"1.1.0"}]}],"versions":[],"rawVersionEvidence":null}],"metrics":[{"system":"CVSS_V4","vector":"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","score":null,"severity":null},{"system":"Publisher rating","vector":null,"score":null,"severity":"MODERATE"}],"references":["https://github.com/vitejs/vite/security/advisories/GHSA-vfpm-58rq-9qcg","https://nvd.nist.gov/vuln/detail/CVE-2026-112947","https://github.com/vitejs/vite/pull/23655","https://github.com/vitejs/vite/commit/b6c6d2fb3f853aab4092dc25f0d6816a96c23dff","https://github.com/vitejs/vite/commit/ba8b7ab43b4afa5d0292ab4b6e3a7b5033cc9c73","https://github.com/vitejs/vite"],"sourceUrl":"https://github.com/advisories/GHSA-vfpm-58rq-9qcg","license":"GitHub Advisory Database · CC-BY-4.0","key":"osv:GHSA-vfpm-58rq-9qcg","identifiers":["GHSA-vfpm-58rq-9qcg","CVE-2026-112947"]},"retained":false,"historicalAffected":[]}],"coverage":[]}