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Vulnerability DatabaseCVE-2026-39844

CVE-2026-39844: 
Python vulnerability analysis and mitigation

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.

Source: NVD

Related Python vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

GHSA-66hx-chf7-3332HIGH8.8
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  • pyload-ng
NoNoApr 14, 2026
CVE-2026-40192HIGH8.7
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CVE-2026-40347MEDIUM5.3
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GHSA-jj6c-8h6c-hppxMEDIUM4.8
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GHSA-fj52-5g4h-gmq8LOW2.9
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NoNoApr 14, 2026

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