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CVE-2026-39844

NiceGUI has a Path Traversal in NiceGUI Upload Filename on Windows via Backslash Bypass of PurePosixPath Sanitization PUBLISHED

Description (CNA)

NiceGUI is a Python-based UI framework. Prior to 3.10.0, Since PurePosixPath only recognizes forward slashes (/) as path separators, an attacker can bypass this sanitization on Windows by using backslashes (\) in the upload filename. Applications that construct file paths using file.name (a pattern demonstrated in NiceGUI's bundled examples) are vulnerable to arbitrary file write on Windows. This vulnerability is fixed in 3.10.0.

Affected (CNA)

Vendor / productVersions
zauberzeug / niceguiaffected < 3.10.0

CWE

CWE-22

References

ADP enrichment

CISA-ADP

No English description supplied.

No references supplied.