CVE-2026-45553

High

Description

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.

SeverityHigh

CVSS7.5

Exploit probability—

ProductNicegui

PublishedJun 2, 2026

First seenJun 2, 2026

Weakness typeCWE-200Sensitive information exposure

How to fix

Update

nicegui3.12.0 or later

Affected products

Product	Affected versions	Fixed in
niceguiPyPI	v < 3.12.0	3.12.0

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