Medium severity5.9NVD Advisory· Published Apr 8, 2026· Updated Apr 15, 2026
CVE-2026-39844
CVE-2026-39844
Description
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
niceguiPyPI | < 3.10.0 | 3.10.0 |
Affected products
2Patches
Vulnerability mechanics
References
5- github.com/zauberzeug/nicegui/commit/d38a702e3af2da5b0708f689be8d71413fc77056nvdPatchWEB
- github.com/advisories/GHSA-w8wv-vfpc-hw2wghsaADVISORY
- github.com/zauberzeug/nicegui/security/advisories/GHSA-w8wv-vfpc-hw2wnvdVendor AdvisoryWEB
- nvd.nist.gov/vuln/detail/CVE-2026-39844ghsaADVISORY
- github.com/zauberzeug/nicegui/releases/tag/v3.10.0nvdRelease NotesWEB
News mentions
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