CVE-2026-21874

MEDIUM5.3

NiceGUI has Redis connection leak via tab storage causes service degradation

Published Jan 8, 2026

Modified 1 weeks ago

No fix available

Details

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

WEBhttps://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83 WEBhttps://github.com/zauberzeug/nicegui/releases/tag/v3.5.0 DETECTIONhttps://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2 ADVISORYhttps://www.cve.org/CVERecord?id=CVE-2026-21874

CVSS Analysis

CVSS v3.1

5.3

Exploitability

Attack Vector

NetworkAV:N

Attack Complexity

LowAC:L

Privileges Required

NonePR:N

User Interaction

NoneUI:N

Scope

UnchangedS:U

Impact

Confidentiality

NoneC:N

Integrity

NoneI:N

Availability

LowA:L

5.3/CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Weakness Type (CWE)

Other

CWE-772

Ecosystems

Timeline

PublishedJan 8, 2026

ModifiedJan 8, 2026