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Medium

vite allows server.fs.deny bypass via backslash on Windows

  • Disclosed: 20.10.2025
  • Updated: 11.10.2026 10:22

Summary

Files denied by server.fs.deny were sent if the URL ended with \ when the dev server is running on Windows.

Impact

Only apps that match the following conditions are affected:

  • explicitly exposes the Vite dev server to the network (using --host or server.host config option)
  • running the dev server on Windows

Details

server.fs.deny can contain patterns matching against files (by default it includes .env, .env.*, *.{crt,pem} as such patterns). These patterns were able to bypass by using a back slash(\). The root cause is that fs.readFile('/foo.png/') loads /foo.png.

PoC

bash
npm create vite@latest
cd vite-project/
cat "secret" > .env
npm install
npm run dev
curl --request-target /.env\ http://localhost:5173
<img width="1593" height="616" alt="image" src="https://github.com/user-attachments/assets/36212f4e-1d3c-4686-b16f-16b35ca9e175" />

Affected software

Click a technology to see all vulnerabilities affecting it.

PlatformPackageVulnerable versionsFixed in
npm package vite >= 7.1.0, < 7.1.11, >= 7.0.0, < 7.0.8, >= 6.0.0, < 6.4.1, >= 2.9.18, < 5.4.21, >= 3.2.9, < 5.4.21, >= 4.5.3, < 5.4.21, >= 5.2.6, < 5.4.21 7.1.11, 7.0.8, 6.4.1, 5.4.21

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-22
Platform
npm
Package
vite
Disclosed
20.10.2025
Updated
11.10.2026 10:22

Sources and licenses

OSV / GitHub Advisory Database - GHSA-93m4-6634-74q7 - 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 allows server.fs.deny bypass via backslash on Windows this entry
    Medium CVE-2025-62522 >= 7.1.0, < 7.1.11, >= 7.0.0, < 7.0.8, >= 6.0.0, < 6.4.1, >= 2.9.18, < 5.4.21, >= 3.2.9, < 5.4.21, >= 4.5.3, < 5.4.21, >= 5.2.6, < 5.4.21 7.1.11, 7.0.8, 6.4.1, 5.4.21
  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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