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CVE Vulnerability Details :
CVE-2026-21874
PUBLISHED
More InfoOfficial Page
Assigner-GitHub_M
Assigner Org ID-a0819718-46f1-4df5-94e2-005712e83aaa
View Known Exploited Vulnerability (KEV) details
Published At-08 Jan, 2026 | 09:50
Updated At-08 Jan, 2026 | 14:43
Rejected At-
▼CVE Numbering Authority (CNA)
NiceGUI has Redis connection leak via tab storage causes service degradation

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 Products
Vendor
zauberzeug
Product
nicegui
Versions
Affected
  • >= 2.10.0, < 3.5.0
Problem Types
TypeCWE IDDescription
CWECWE-772CWE-772: Missing Release of Resource after Effective Lifetime
Type: CWE
CWE ID: CWE-772
Description: CWE-772: Missing Release of Resource after Effective Lifetime
Metrics
VersionBase scoreBase severityVector
3.15.3MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Version: 3.1
Base score: 5.3
Base severity: MEDIUM
Vector:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2
x_refsource_CONFIRM
https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83
x_refsource_MISC
https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0
x_refsource_MISC
Hyperlink: https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2
Resource:
x_refsource_CONFIRM
Hyperlink: https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83
Resource:
x_refsource_MISC
Hyperlink: https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0
Resource:
x_refsource_MISC
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2
exploit
Hyperlink: https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2
Resource:
exploit
Details not found