CVE-2026-21874

MEDIUM

NiceGUI 2.10.0-3.4.1 - Unauthenticated Resource Exhaustion via Redis Connection Leak

Title source: llm
STIX 2.1

Description

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.

References (3)

Core 3

Scores

CVSS v3 5.3
EPSS 0.0051
EPSS Percentile 39.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation poc
Automatable yes
Technical Impact partial

Details

CWE
CWE-772
Status published
Products (2)
pypi/nicegui 2.10.0 - 3.5.0PyPI
zauberzeug/nicegui 2.10.0 - 3.5.0
Published Jan 08, 2026
Tracked Since Feb 18, 2026