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CVE-2026-21874

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published1/8/2026

Last Modified1/15/2026

Sourcenvd

Honeypot Sightings0

Affected Products

zauberzeug:nicegui

Weaknesses (CWE)

CWE-772

References

https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83(security-advisories@github.com)

https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0(security-advisories@github.com)

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2(security-advisories@github.com)

https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2(134c704f-9b21-4f2e-91b3-4a467353bcc0)

IOC Correlations

No correlations recorded

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