Vulnerability Monitor

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CVE-2026-21860

Werkzeug is a comprehensive WSGI web application library. Prior to version 3.1.5, Werkzeug's safe_join function allows path segments with Windows device names that have file extensions or trailing spaces. On Windows, there are special device names such as CON, AUX, etc that are implicitly present and readable in every directory. Windows still accepts them with any file extension, such as CON.txt, or trailing spaces such as CON. This issue has been patched in version 3.1.5.

Published

2026-01-08T19:15:59.000

Last Modified

2026-02-02T17:15:30.510

Status

Analyzed

Source

[email protected]

Severity

CVSSv3.1: 5.3 (MEDIUM)

Weaknesses
  • Type: Primary
    CWE-67
Affected Vendors & Products
Type Vendor Product Version/Range Vulnerable?
Application palletsprojects werkzeug < 3.1.5 Yes
Operating System microsoft windows - No
References