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CVE-2026-21874

CVE-2026-21874 · NiceGUI has Redis connection leak via tab storage causes service degradation

This page contains facts from public vulnerability sources. Check the original advisory before updating.

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 · EPSS 0.6% · Fix available

Published
Updated

Stack: python

Affected products and versions

  • nicegui

    Versions
    • >= 2.10.0, < 3.5.0: Affected

    No fix published

  • nicegui PyPI

    Versions
    • 2.10.0
    • 2.10.1
    • 2.11.0
    • 2.11.1
    • 2.12.0
    • 2.12.1
    • 2.13.0
    • 2.14.0
    • 2.14.1
    • 2.15.0
    • 2.16.0
    • 2.16.1
    • 2.17.0
    • 2.18.0
    • 2.19.0
    • 2.20.0
    • 2.21.0
    • 2.21.1
    • 2.22.0
    • 2.22.1
    • 2.22.2
    • 2.23.0
    • 2.23.1
    • 2.23.2
    • 2.23.3
    • 2.24.0
    • 2.24.1
    • 2.24.2
    • 3.0.0
    • 3.0.0rc1
    • 3.0.1
    • 3.0.2
    • 3.0.3
    • 3.0.4
    • 3.1.0
    • 3.2.0
    • 3.3.0
    • 3.3.1
    • 3.4.0
    • 3.4.1
    Affected ranges
    • ECOSYSTEM: ≥ 2.10.0, < 3.5.0

    Update to 3.5.0

Original sources

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