CVE-2026-21874 | THREATINT

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.

PUBLISHED Reserved 2026-01-05 | Published 2026-01-08 | Updated 2026-01-08 | Assigner GitHub_M

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

Problem types

CWE-772: Missing Release of Resource after Effective Lifetime

Product status

>= 2.10.0, < 3.5.0

affected

References

github.com/...icegui/security/advisories/GHSA-mp55-g7pj-rvm2 exploit

github.com/...icegui/security/advisories/GHSA-mp55-g7pj-rvm2

github.com/...ommit/6c52eb2c90c4b67387c025b29646b4bc1578eb83

github.com/zauberzeug/nicegui/releases/tag/v3.5.0

cve.org (CVE-2026-21874)

nvd.nist.gov (CVE-2026-21874)

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