Medium 5.3Published Jan 8, 2026

CVE-2026-21874NiceGUI is a Python-based UI framework.

Updated under an hour ago (2026-10-19 07:20 UTC)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for zauberzeug nicegui

Exploited in the last 30 days

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.

CVSS: 5.3 MEDIUM (v3.1, NVD)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Weakness (CWE): CWE-772
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Not given
NVD analysis: Analyzed
Record last updated: Jun 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

zauberzeug nicegui zauberzeug:nicegui	from 2.10.0 before 3.5.0	NVD

References

https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83patch
https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0release-notes
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2exploit, vendor-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.