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CVE-2026-21874
Good to know:
Date: January 8, 2026
NiceGUI is a Python-based UI framework. From versions v2.10.0 to 3.4.1, an unauthenticated attacker can exhaust Redis connections by repeatedly opening and closing browser tabs on any NiceGUI application using Redis-backed storage. Connections are never released, leading to service degradation when Redis hits its connection limit. NiceGUI continues accepting new connections - errors are logged but the app stays up with broken storage functionality. This issue has been patched in version 3.5.0.
Severity Score
Related Resources (6)
Severity Score
Weakness Type (CWE)
Missing Release of Resource after Effective Lifetime
CWE-772Top Fix
Upgrade Version
Upgrade to version nicegui - 3.5.0;https://github.com/zauberzeug/nicegui.git - v3.5.0
CVSS v3.1
| Base Score: |
|
|---|---|
| Attack Vector (AV): | NETWORK |
| Attack Complexity (AC): | LOW |
| Privileges Required (PR): | NONE |
| User Interaction (UI): | NONE |
| Scope (S): | UNCHANGED |
| Confidentiality (C): | NONE |
| Integrity (I): | NONE |
| Availability (A): | LOW |