zauberzeug nicegui up to 3.11.x sub-path uncaught exception

Summaryinfo

A vulnerability has been found in zauberzeug nicegui up to 3.11.x and classified as problematic. This issue affects some unknown processing. Performing a manipulation of the argument sub-path results in uncaught exception. This vulnerability is known as CVE-2026-45554. Remote exploitation of the attack is possible. No exploit is available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as problematic has been found in zauberzeug nicegui up to 3.11.x. This affects an unknown part. The manipulation of the argument sub-path with an unknown input leads to a uncaught exception vulnerability. CWE is classifying the issue as CWE-248. An exception is thrown from a function, but it is not caught. This is going to have an impact on availability. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-45554 since 05/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. No form of authentication is needed for exploitation. Technical details are known, but no exploit is available.

Upgrading to version 3.12.0 eliminates this vulnerability. The upgrade is hosted for download at github.com.

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Productinfo

Vendor

• zauberzeug

Name

• nicegui

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8
• 3.9
• 3.10
• 3.11

Website

• Product: https://github.com/zauberzeug/nicegui/

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