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

Quick assessment

Affected
zauberzeug nicegui
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI v2.10.0版本至3.4.1版本存在安全漏洞，该漏洞源于未经验证的攻击者可耗尽Redis连接，可能导致服务降级。

CVSS 5.3 · Medium EPSS 0.55% · P45

Possible ATT&CK Techniques 1 AI

T1499.002 · Service Exhaustion Flood
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I. Basic Information for CVE-2026-21874

Vulnerability Information
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Vulnerability Title
NiceGUI has Redis connection leak via tab storage causes service degradation
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
对已超过有效生命周期的资源丧失索引
Source: CVE Program / CVE List V5
Vulnerability Title
NiceGUI 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
NiceGUI是NiceGUI开源的一个易于使用、基于 Python 的 UI 框架。 NiceGUI v2.10.0版本至3.4.1版本存在安全漏洞，该漏洞源于未经验证的攻击者可耗尽Redis连接，可能导致服务降级。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
zauberzeug nicegui >= 2.10.0, < 3.5.0 -

II. Public POCs for CVE-2026-21874

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III. Intelligence Information for CVE-2026-21874

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Patches & Fixes for CVE-2026-21874 (1)

Vendor Advisories for CVE-2026-21874 (1)

Other References for CVE-2026-21874 (1)

Same Patch Batch · zauberzeug · 2026-01-08 · 4 CVEs total

CVE-2026-21873 7.2 HIGH Zero-click XSS in all NiceGUI apps which uses `ui.sub_pages`
CVE-2026-21871 6.1 MEDIUM NiceGUI is vulnerable to XSS via Unescaped URL in ui.navigate.history.push() / replace()
CVE-2026-21872 6.1 MEDIUM NiceGUI apps are vulnerable to XSS which uses `ui.sub_pages` and render arbitrary user-pro

IV. Related Vulnerabilities

Same product: nicegui
Same vendor: zauberzeug
Same weakness: CWE-772

V. Comments for CVE-2026-21874

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