NiceGUI: Local file disclosure via Docutils file insertion in ui.restructured_text() — CVE-2026-45553

Summary

### Summary `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…

Product

pip: nicegui

What to do

General, cautious steps (verify details in the official source):

• Prioritize patching or mitigation immediately (treat as actively risky).
• Identify affected product versions in your inventory and verify whether you are impacted.
• Apply vendor patches/updates or recommended mitigations as soon as available.
• Read the official advisory for exact affected versions and remediation steps.

Official advisory

• Read the official source
• CVE Record
• NVD

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