Summaryinfo

A vulnerability marked as problematic has been reported in zauberzeug nicegui up to 3.8.x. This impacts the function app.add_media_file/app.add_media_files of the component Query Parameter Handler. This manipulation causes denial of service. This vulnerability is tracked as CVE-2026-33332. The attack is possible to be carried out remotely. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in zauberzeug nicegui up to 3.8.x and classified as problematic. Affected by this vulnerability is the function app.add_media_file/app.add_media_files of the component Query Parameter Handler. The manipulation with an unknown input leads to a denial of service vulnerability. The CWE definition for the vulnerability is CWE-404. The product does not release or incorrectly releases a resource before it is made available for re-use. As an impact it is known to affect availability. The summary by CVE is:

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.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-33332 since 03/18/2026. The exploitation appears to be easy. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1499 according to MITRE ATT&CK.

Upgrading to version 3.9.0 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• zauberzeug

Name

• nicegui

Version

• 3.0
• 3.1
• 3.2
• 3.3
• 3.4
• 3.5
• 3.6
• 3.7
• 3.8

Website

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

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