CVE-2026-39844

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.
Configurations

Configuration 1 (hide)

AND
cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

History

15 Apr 2026, 19:08

Type Values Removed Values Added
References () https://github.com/zauberzeug/nicegui/commit/d38a702e3af2da5b0708f689be8d71413fc77056 - () https://github.com/zauberzeug/nicegui/commit/d38a702e3af2da5b0708f689be8d71413fc77056 - Patch
References () https://github.com/zauberzeug/nicegui/releases/tag/v3.10.0 - () https://github.com/zauberzeug/nicegui/releases/tag/v3.10.0 - Release Notes
References () https://github.com/zauberzeug/nicegui/security/advisories/GHSA-w8wv-vfpc-hw2w - () https://github.com/zauberzeug/nicegui/security/advisories/GHSA-w8wv-vfpc-hw2w - Vendor Advisory
First Time Microsoft
Zauberzeug
Zauberzeug nicegui
Microsoft windows
CPE cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:*

08 Apr 2026, 21:16

Type Values Removed Values Added
New CVE

Information

Published : 2026-04-08 21:16

Updated : 2026-04-15 19:08


NVD link : CVE-2026-39844

Mitre link : CVE-2026-39844

CVE.ORG link : CVE-2026-39844


JSON object : View

Products Affected

zauberzeug

  • nicegui

microsoft

  • windows
CWE
CWE-22

Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')