CVE-2026-45553: Zauberzeug Nicegui

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

NiceGUI is a Python-based UI framework. Prior to version 3.12.0, ui.restructured_text() renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructured_text(), an attacker can use standard Docutils directives (include, csv-table with :file:, raw with :file:) to read local files readable by the NiceGUI server process. Applications that only pass trusted static strings to ui.restructured_text() are not affected. This issue has been patched in version 3.12.0.

Affected products

• Zauberzeug Nicegui: before 3.12.0 (fixed in 3.12.0)

Published 2026-06-02. Last modified 2026-07-22.