CVE-2026-27199 – Werkzeug safe_join() allows Windows special device names

CVE ID : CVE-2026-27199

Published : Feb. 21, 2026, 6:17 a.m. | 47 minutes ago

Description : Werkzeug is a comprehensive WSGI web application library. Versions 3.1.5 and below, the safe_join function allows Windows device names as filenames if preceded by other path segments. This was previously reported as GHSA-hgf8-39gv-g3f2, but the added filtering failed to account for the fact that safe_join accepts paths with multiple segments, such as example/NUL. The function 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 fixed in version 3.1.6.

Severity: 6.3 | MEDIUM

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