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CVE-2026-21874

nvd nist
Published: Jan 8, 2026Modified: Jun 17, 2026

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5.3
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Exploitability: 3.9 / Impact: 1.4
Source: security-advisories@github.com (Secondary)

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.

Affected (1)

Products: Zauberzeug: Nicegui
Zauberzeug
1 product
Nicegui
Configuration A
1 vulnerable
Vulnerable SoftwareAffected Versions
Nicegui
From 2.10.0 to 3.5.0

Related CWEs

CWE-772
Missing Release of Resource after Effective Lifetime
The product does not release a resource after its effective lifetime has ended, i.e., after the resource is no longer needed.

References (4)

Source: security-advisories@github.com
Patch
Source: security-advisories@github.com
Release Notes
Source: security-advisories@github.com
ExploitVendor Advisory
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
ExploitVendor Advisory

Timeline

No history available yet.