Vite has an `server.fs.deny` bypass with an invalid `request-target`

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Vite is a frontend tooling framework for javascript. Prior to 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13, the contents of arbitrary files can be returned to the browser if the dev server is running on Node or Bun. 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. 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. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) and running the Vite dev server on runtimes that are not Deno (e.g. Node, Bun) are affected. This vulnerability is fixed in 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13.

Source published

10 Apr 2025 13:25:19 UTC

Source modified

10 Apr 2025 14:14:40 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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CVE Program Terms of Use

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CVSS 4.0 · 6.0 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

Vite is a frontend tooling framework for javascript. Prior to 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13, the contents of arbitrary files can be returned to the browser if the dev server is running on Node or Bun. 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. 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. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) and running the Vite dev server on runtimes that are not Deno (e.g. Node, Bun) are affected. This vulnerability is fixed in 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13.

Source published

Apr 10, 2025, 1:25:19 PM (timezone not stated)

Source modified

Apr 10, 2025, 2:14:40 PM (timezone not stated)

Saved here

15 Nov 2026 03:41:26 UTC

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ENISA EUVD · source terms and attribution apply

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EUVD CVSS 4.0 · 6.0 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

Vite is a frontend tooling framework for javascript. Prior to 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13, the contents of arbitrary files can be returned to the browser if the dev server is running on Node or Bun. 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. 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. Only apps explicitly exposing the Vite dev server to the network (using --host or server.host config option) and running the Vite dev server on runtimes that are not Deno (e.g. Node, Bun) are affected. This vulnerability is fixed in 6.2.6, 6.1.5, 6.0.15, 5.4.18, and 4.5.13.

Source published

10 Apr 2025 14:15:29 UTC

Source modified

17 Jun 2026 09:11:55 UTC

Saved here

25 Oct 2026 02:24:48 UTC

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CVSS 4.0 · [email protected] · Secondary · 6.0 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

### 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](https://vitejs.dev/config/server-options.html#server-host)) - 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`](https://datatracker.ietf.org/doc/html/rfc9112#section-3.2). 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](https://datatracker.ietf.org/doc/html/rfc9112#section-3.2-4). The same can be said for HTTP 2 ([ref1](https://datatracker.ietf.org/doc/html/rfc9113#section-8.3.1-2.4.1), [ref2](https://datatracker.ietf.org/doc/html/rfc9113#section-8.3.1-3), [ref3](https://datatracker.ietf.org/doc/html/rfc9113#section-8.1.1-3)). 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`](https://nodejs.org/docs/latest-v22.x/api/http.html#messageurl) 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 dev ``` send request to read `/etc/passwd` ``` curl --request-target /@fs/Users/doggy/Desktop/vite-project/#/../../../../../etc/passwd http://127.0.0.1:5173 ```

Source published

11 Apr 2025 14:06:03 UTC

Source modified

10 Sep 2026 03:50:56 UTC

Saved here

24 Oct 2026 13:17:17 UTC

Source terms

GitHub Advisory Database · CC-BY-4.0

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CVSS_V4 · 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

Publisher rating · MODERATE