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Luu, T.J.

GHSA-jfrm-rx66-g536: NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text()

highvulnerability

security

Source: GitHub Advisory DatabaseMay 18, 2026CVE-2026-45553

Summary

NiceGUI's `ui.restructured_text()` function renders user-supplied reStructuredText using Docutils without disabling file insertion directives, allowing attackers to read local files accessible to the server using standard Docutils directives like `include` and `raw`. This vulnerability only affects applications that pass untrusted or user-controlled content to this function, not those using only static trusted strings.

Solution / Mitigation

Disable unsafe Docutils features by modifying the `publish_parts()` call in `prepare_content()` to include these `settings_overrides`: `'file_insertion_enabled': False`, `'raw_enabled': False`, and `'_disable_config': True`. This blocks the `include`, `csv-table :file:`, and `raw :file:` directives as well as local `docutils.conf` overrides.