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CVE-2026-53571 is a Windows-specific path normalization flaw in Vite’s development server that allows files intended to be blocked by server.fs.deny to be returned to the browser. In affected versions prior to 6.4.3, 7.3.5, and 8.0.16, the deny logic does not correctly normalize Windows NTFS alternate path forms before applying access checks. This allows requests using NTFS Alternate Data Streams syntax and Windows 8.3 short-name aliases to bypass deny rules for sensitive files such as environment files and certificate or key material. The issue affects Vite dev servers on Windows and results in unauthorized disclosure of files that should have been denied by the filesystem access policy.
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server.fs.deny. Exposed content can include environment configuration, secrets, credentials, certificates, and private key material, depending on what exists within allowed directories. The primary impact is information disclosure, which can enable follow-on compromise of applications, developer environments, or connected services.If you can’t patch tonight, do this now.
server.fs.allow, and limit use of Windows-hosted development environments where NTFS alternate path forms and 8.3 short-name access can be abused.Patch, then assume compromise.
1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository is a minimal proof-of-concept for CVE-2026-53571, a Windows-specific Vite file disclosure issue described as a server.fs.deny bypass using alternate paths. The repository contains only two files: a short README with setup/verification steps and a single Python script (poc.py) that serves as the exploit entry point. The script disables TLS warnings, defines one hardcoded target URL, sends a GET request with requests, and prints the response status and body. The exploit capability is limited but clear: it attempts to read a sensitive file (.env) that should be blocked by Vite's server.fs.deny by requesting the path '.env::$DATA?raw', leveraging Windows NTFS alternate data stream syntax. There is no shell, code execution, persistence, or post-exploitation logic; the outcome is file content disclosure only. The code is operational as a simple local PoC against a Vite dev server on localhost:5173, but it is not weaponized or generalized beyond the single hardcoded endpoint.
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5 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity path traversal and information exposure vulnerability in Vite's dev server on Windows that allows bypassing server.fs.deny via NTFS Alternate Data Streams and 8.3 short-name aliases to read sensitive files such as .env files and certificates.
A Vite vulnerability that allows bypass of `server.fs.deny` on Windows via NTFS alternate data stream path forms and 8.3 short-name paths, enabling unauthorized access to sensitive files served by the dev server.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.