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Medium

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

  • Disclosed: 11.04.2025
  • Updated: 11.10.2026 10:22

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

bash
npm create vite@latest
cd vite-project/
npm install
npm run dev

send request to read /etc/passwd

bash
curl --request-target /@fs/Users/doggy/Desktop/vite-project/#/../../../../../etc/passwd http://127.0.0.1:5173

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package 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

References

CVSS score -
CVSS vector
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
Weakness (CWE)
CWE-200
Platform
npm
Package
vite
Disclosed
11.04.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-356w-63v5-8wf4 - CC BY 4.0

Vulnerability history: vite

All published vulnerabilities of this package (npm package), newest first. Shows whether this is a one-off slip or a package that needs watching.

All (24) in the archive
Total entries
24
First → latest
08.2022 10.2026
Without a fix
0
Exploited in attacks
1

Severity breakdown

  • High 8
  • Medium 14
  • Low 2

Disclosures per year

Severity:
  1. launch-editor: `fs.existsSync()` existence check can be bypassed on Windows
    High CVE-2026-112942 >= 8.3.0, < 8.3.3, >= 8.2.0, < 8.2.4, >= 8.0.0, < 8.1.6, >= 7.0.0, < 7.3.7, < 6.4.4 8.3.3, 8.2.4, 8.1.6, 7.3.7, 6.4.4
  2. vite: `server.fs.deny` bypass on Windows alternate paths
    High · 7.5 CVE-2026-53571 >= 8.0.0, < 8.0.16, >= 7.0.0, < 7.3.5, < 6.4.3 8.0.16, 7.3.5, 6.4.3
  3. launch-editor vulnerable to command injection via the crafted request on Windows
    High CVE-2024-52011 < 5.4.9 5.4.9
  4. Vite: `server.fs.deny` bypassed with queries
    High CVE-2026-39364 >= 8.0.0, < 8.0.5, >= 7.1.0, < 7.3.2 8.0.5, 7.3.2
  5. Vite Vulnerable to Arbitrary File Read via Vite Dev Server WebSocket
    High CVE-2026-39363 >= 8.0.0, < 8.0.5, >= 7.0.0, < 7.3.2, >= 6.0.0, < 6.4.2 8.0.5, 7.3.2, 6.4.2
  6. Vite has an `server.fs.deny` bypass with an invalid `request-target` this entry
    Medium CVE-2025-32395 >= 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
  7. Vite dev server option `server.fs.deny` can be bypassed when hosted on case-insensitive filesystem
    High · 7.5 CVE-2024-23331 >= 2.7.0, < 2.9.17, >= 3.0.0, < 3.2.8, >= 4.0.0, < 4.5.2, >= 5.0.0, < 5.0.12 2.9.17, 3.2.8, 4.5.2, 5.0.12
  8. Vite Server Options (server.fs.deny) can be bypassed using double forward-slash (//)
    High · 7.5 CVE-2023-34092 < 2.9.16, >= 3.0.2, < 3.2.7, >= 4.0.0, < 4.0.5, >= 4.1.0, < 4.1.5, >= 4.2.0, < 4.2.3, >= 4.3.0, < 4.3.9 2.9.16, 3.2.7, 4.0.5, 4.1.5, 4.2.3, 4.3.9
  9. Vite before v2.9.13 vulnerable to directory traversal via crafted URL to victim's service
    High · 8.6 CVE-2022-35204 < 2.9.13, >= 3.0.0-alpha.0, < 3.0.0-beta.4 2.9.13, 3.0.0-beta.4

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