CVE-2026-33332 in zauberzeug nicegui

Summary

NiceGUI is a Python-based UI framework. Prior to version 3.9.0, NiceGUI's app.add_media_file() and app.add_media_files() media routes accept a user-controlled query parameter that influences how files are read during streaming. The parameter is passed to the range-response implementation without validation, allowing an attacker to bypass chunked streaming and force the server to load entire files into memory at once. With large media files and concurrent requests, this can lead to excessive memory consumption, degraded performance, or denial of service. This issue has been patched in version 3.9.0.

Responsible

GitHub_M

Reservation

03/18/2026

Disclosure

03/24/2026

Entries

VulDB provides additional information and datapoints for this CVE:

ID	Vulnerability	CWE	Exp	Cou	CVE
352867	zauberzeug nicegui Query Parameter app.add_media_files denial of service	404	Not defined	Official fix	CVE-2026-33332