CVE-2026-45554: Zauberzeug Nicegui

Medium severity, CVSS 5.3. EPSS: 0.6% chance of exploitation in the next 30 days.

NiceGUI is a Python-based UI framework. Prior to version 3.12.0, two FastAPI routes that serve per-component static assets in NiceGUI accept a sub-path parameter that may resolve to a directory rather than a file. Requests that resolve to a directory raise an unhandled RuntimeError inside Starlette's FileResponse, which Uvicorn writes to the server log as a full traceback. Because the routes are reachable without authentication, a remote attacker can amplify log volume and consume disk and log-pipeline capacity on any publicly reachable NiceGUI server. 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.