Vite has an `server.fs.deny` bypass with an invalid `request-target`
Summary
The contents of arbitrary files can be returned to the browser if the dev server is running on Node or Bun.
Impact
Only apps with the following conditions are affected.
- explicitly exposing the Vite dev server to the network (using --host or server.host config option)
- running the Vite dev server on runtimes that are not Deno (e.g. Node, Bun)
Details
HTTP 1.1 spec (RFC 9112) does not allow # in request-target. Although an attacker can send such a request. For those requests with an invalid request-line (it includes request-target), the spec recommends to reject them with 400 or 301. The same can be said for HTTP 2 (ref1, ref2, ref3).
On Node and Bun, those requests are not rejected internally and is passed to the user land. For those requests, the value of http.IncomingMessage.url contains #. Vite assumed req.url won't contain # when checking server.fs.deny, allowing those kinds of requests to bypass the check.
On Deno, those requests are not rejected internally and is passed to the user land as well. But for those requests, the value of http.IncomingMessage.url did not contain #.
PoC
npm create vite@latest
cd vite-project/
npm install
npm run devsend request to read /etc/passwd
curl --request-target /@fs/Users/doggy/Desktop/vite-project/#/../../../../../etc/passwd http://127.0.0.1:5173Software afectado
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| Plataforma | Paquete | Versiones vulnerables | Corregida en |
|---|---|---|---|
| Paquete de npm | vite | >= 6.2.0, < 6.2.6, >= 6.1.0, < 6.1.5, >= 6.0.0, < 6.0.15, >= 5.0.0, < 5.4.18, < 4.5.13 | 6.2.6, 6.1.5, 6.0.15, 5.4.18, 4.5.13 |
Referencias
- Vector CVSS
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N- Debilidad (CWE)
CWE-200- Plataforma
- npm
- Paquete
vite- Publicada
- 11.04.2025
- Actualizado
- 11.10.2026 10:22
Fuentes y licencias
OSV / GitHub Advisory Database - GHSA-356w-63v5-8wf4 - CC BY 4.0
Historial de vulnerabilidades: vite
Todas las vulnerabilidades publicadas de este paquete (Paquete de npm), de la más reciente a la más antigua. Muestra si es un fallo aislado o un paquete que hay que vigilar.
- Entradas en total
- 24
- Primera → última
- 08.2022 10.2026
- Sin corrección
- 0
- Explotada en ataques
- 1
Distribución por gravedad
- Alta 8
- Media 14
- Baja 2
Divulgaciones por año
- 2022: 1
- 2023: 2
- 2024: 4
- 2025: 9
- 2026: 8
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Vite has an `server.fs.deny` bypass with an invalid `request-target` esta entrada
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