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CVE-2026-27199 PUBLISHED CVSS 6.300000190734863 MEDIUM

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.

EPSS 0.02% · 5.2th percentile

Risk Scores

CVSS v4.0
6.300000190734863
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
EPSS Score
0.02%
5.2th percentile

Affected Products

VendorProductVersions
palletsprojectswerkzeug0
palletswerkzeug< 3.1.6
PyPIwerkzeug0

Timeline

References

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