Redis · Redis · CVE-2026-21874
**Name of the Vulnerable Software and Affected Versions**
NiceGUI versions 2.10.0 through 3.4.1
**Description**
NiceGUI is a Python-based UI framework. An unauthenticated attacker can exhaust Redis connections by repeatedly opening and closing browser tabs on any NiceGUI application using Redis-backed storage. Connections are not released, leading to service degradation when Redis reaches its connection limit. NiceGUI continues accepting new connections, but errors are logged and storage functionality is broken.
**Recommendations**
Upgrade to version 3.5.0 or later.