CVE-2026-21874 (GCVE-0-2026-21874)
Vulnerability from cvelistv5 – Published: 2026-01-08 09:50 – Updated: 2026-01-08 14:43
VLAI
EPSS
VEX
Title
NiceGUI has Redis connection leak via tab storage causes service degradation
Summary
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.
Severity
5.3 (Medium)
SSVC
Exploitation: poc
Automatable: yes
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-01-08 14:43 UTC
CWE
- CWE-772 - Missing Release of Resource after Effective Lifetime
Assigner
GitHub_M
CNA
References
3 references
| URL | Tags |
|---|---|
| https://github.com/zauberzeug/nicegui/security/ad… | x_refsource_CONFIRM |
| https://github.com/zauberzeug/nicegui/commit/6c52… | x_refsource_MISC |
| https://github.com/zauberzeug/nicegui/releases/ta… | x_refsource_MISC |
Impacted products
1 product
| Vendor | Product | Version | |
|---|---|---|---|
| zauberzeug | nicegui |
Affected:
>= 2.10.0, < 3.5.0
|
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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