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CVE-2026-21874

NiceGUI has Redis connection leak via tab storage causes service degradation PUBLISHED

Description (CNA)

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 (CNA)

Vendor / productVersions
zauberzeug / niceguiaffected >= 2.10.0, < 3.5.0

CWE

CWE-772

References

ADP enrichment

CISA-ADP

No English description supplied.