Threat Investigation
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CVE-2025-66645

High

Description

NiceGUI is a Python-based UI framework. Versions 3.3.1 and below are vulnerable to directory traversal through the App.add_media_files() function, which allows a remote attacker to read arbitrary files on the server filesystem. This issue is fixed in version 3.4.0.

SeverityHigh
CVSS7.5
Exploit probability—
ProductZauberzeug Nicegui
PublishedDec 9, 2025
First seenDec 9, 2025
Weakness typeCWE-22Path traversal

How to fix

Update
  • zauberzeug nicegui3.4.0 or later
  • nicegui3.4.0 or later

Affected products

ProductAffected versionsFixed in
zauberzeug niceguiv < 3.4.03.4.0
niceguiPyPIv < 3.4.03.4.0

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