Description
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.
References (2)
Core 2
Core References
Vendor Advisory x_refsource_confirm
https://github.com/pallets/werkzeug/security/advisories/GHSA-87hc-h4r5-73f7
Scores
CVSS v3
5.3
EPSS
0.0002
EPSS Percentile
6.2%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-67
Status
published
Products (2)
palletsprojects/werkzeug
< 3.1.5
pypi/Werkzeug
0 - 3.1.5PyPI
Published
Jan 08, 2026
Tracked Since
Feb 18, 2026