CVE-2025-62522: Vite server.fs.deny bypass via backslash on Windows

CVE-2025-62522 · Severity: medium · CVSS 4 · Published 2025-10-20

Vite is a popular build tool and development server for modern JavaScript applications. On Windows systems, an attacker can bypass file access restrictions (server.fs.deny) by appending a backslash to URLs, allowing exposure of sensitive files like environment configuration and cryptographic keys. This only affects development servers explicitly exposed to the network.

Technologies: Vite. Vendors: Vite.

Quick answers

Is CVE-2025-62522 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2025-62522 being exploited in the wild.
How severe is CVE-2025-62522?
Medium severity, with a CVSS score of 4, published 20 October 2025.
Which products and versions are affected?
Vite >=2.9.18,<3.0.0; >=3.2.9,<4.0.0; >=4.5.3,<5.0.0; >=5.2.6,<=5.4.20; >=6.0.0,<=6.4.0; >=7.0.0,<=7.0.7; >=7.1.0,<=7.1.10.
Is there a fix for CVE-2025-62522?
A patch was published on 2025-10-20: Patches released in versions 5.4.21, 6.4.1, 7.0.8, 7.1.11 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2025-62522 attacked?
It is attacked over the network.
Am I affected by CVE-2025-62522?
Check whether you run Vite at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a path traversal bypass (CWE-22) affecting Vite's file serving restrictions on Windows. The vulnerability stems from fs.readFile('/foo.png/') loading '/foo.png', which allows an attacker to bypass patterns in server.fs.deny by appending a backslash to the request URL (e.g., /.env\). The attack requires the dev server to be running on Windows and explicitly exposed to the network via --host or server.host configuration. An unauthenticated network attacker can read files that should be denied by default (including .env, .env.*, and certificate/key files). Patches are available in versions 5.4.21, 6.4.1, 7.0.8, and 7.1.11 or later.

Affected products

  • Vite Vite >=2.9.18,<3.0.0; >=3.2.9,<4.0.0; >=4.5.3,<5.0.0; >=5.2.6,<=5.4.20; >=6.0.0,<=6.4.0; >=7.0.0,<=7.0.7; >=7.1.0,<=7.1.10

Identifiers

  • CVE-2025-62522
  • GHSA-93m4-6634-74q7

Timeline

  • 2025-10-20: disclosed: Advisory published
  • 2025-10-20: patched: Patches released in versions 5.4.21, 6.4.1, 7.0.8, 7.1.11

References

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