PYSEC-2026-2679 NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

Summary ui.restructuredtext renders reStructuredText server-side with Docutils without disabling file insertion directives. When a NiceGUI application passes attacker-controlled content to ui.restructuredtext, an attacker can use standard Docutils directives include, csv-table with :file:, raw wi...