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CVE-2026-21874

MEDIUM CVSS 3.1: 5.3 EPSS 0.03%
Updated Jan 15, 2026
Zauberzeug
Parameter Value
CVSS 5.3 (MEDIUM)
Affected Versions 2.10.0 — 3.5.0
Fixed In 3.5.0
Type CWE-772
Vendor Zauberzeug
Public PoC No

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.

Attack Parameters

Attack Vector
Network
Can be exploited remotely
Attack Complexity
Low
Easy to exploit
Privileges Required
None
No privileges needed
User Interaction
None
No user interaction needed

Impact Assessment

Confidentiality
None
No data leak
Integrity
None
No data modification
Availability
Low
Partial disruption

CVSS Vector v3.1

Weakness Type (CWE)

Vulnerable Products 1

Configuration From (including) Up to (excluding)
Zauberzeug Nicegui
cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*
2.10.0 3.5.0