CVE-2026-45554: 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…

PriorityP432medium5.3CVSS 3.1

AVNACLPRNUINSUCNINAL

EPSS

0.34%

26.1th percentile

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

2 ranges

Vendor	Product	Version range	Fixed in
zauberzeug	nicegui	< 3.12.0	3.12.0
zauberzeug	nicegui	>= 0 < 3.12.0	3.12.0

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