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CVE-2025-66221

CVE-2025-66221 · Werkzeug safe_join() allows Windows special device names

This page contains facts from public vulnerability sources. Check the original advisory before updating.

Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.4, Werkzeug's safe_join function allows path segments with Windows device names. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. send_from_directory uses safe_join to safely serve files at user-specified paths under a directory. If the application is running on Windows, and the requested path ends with a special device name, the file will be opened successfully, but reading will hang indefinitely. This issue has been patched in version 3.1.4.

CVSS 6.3 · Medium · EPSS 0.5% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • werkzeug

    Versions
    • < 3.1.4: Affected

    No fix published

  • werkzeug PyPI

    Versions
    • 0.1
    • 0.10
    • 0.10.1
    • 0.10.2
    • 0.10.3
    • 0.10.4
    • 0.11
    • 0.11.1
    • 0.11.10
    • 0.11.11
    • 0.11.12
    • 0.11.13
    • 0.11.14
    • 0.11.15
    • 0.11.2
    • 0.11.3
    • 0.11.4
    • 0.11.5
    • 0.11.6
    • 0.11.7
    • 0.11.8
    • 0.11.9
    • 0.12
    • 0.12.1
    • 0.12.2
    • 0.13
    • 0.14
    • 0.14.1
    • 0.15.0
    • 0.15.1
    • 0.15.2
    • 0.15.3
    • 0.15.4
    • 0.15.5
    • 0.15.6
    • 0.16.0
    • 0.16.1
    • 0.2
    • 0.3
    • 0.3.1
    • 0.4
    • 0.4.1
    • 0.5
    • 0.5.1
    • 0.6
    • 0.6.1
    • 0.6.2
    • 0.7
    • 0.7.1
    • 0.7.2
    • 0.8
    • 0.8.1
    • 0.8.2
    • 0.8.3
    • 0.9
    • 0.9.1
    • 0.9.2
    • 0.9.3
    • 0.9.4
    • 0.9.5
    • 0.9.6
    • 1.0.0
    • 1.0.0rc1
    • 1.0.1
    • 2.0.0
    • 2.0.0rc1
    • 2.0.0rc2
    • 2.0.0rc3
    • 2.0.0rc4
    • 2.0.0rc5
    • 2.0.1
    • 2.0.2
    • 2.0.3
    • 2.1.0
    • 2.1.1
    • 2.1.2
    • 2.2.0
    • 2.2.0a1
    • 2.2.1
    • 2.2.2
    • 2.2.3
    • 2.3.0
    • 2.3.1
    • 2.3.2
    • 2.3.3
    • 2.3.4
    • 2.3.5
    • 2.3.6
    • 2.3.7
    • 2.3.8
    • 3.0.0
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.0.4
    • 3.0.5
    • 3.0.6
    • 3.1.0
    • 3.1.1
    • 3.1.2
    • 3.1.3
    Affected ranges
    • ECOSYSTEM: < 3.1.4

    Update to 3.1.4

Original sources

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