Missing Release of Resource after Effective Lifetime Affecting nicegui package, versions [2.10.0,3.5.0)
Threat Intelligence
Snyk has a proof-of-concept or detailed explanation of how to exploit this vulnerability.
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-NICEGUI-14912449
- published11 Jan 2026
- disclosed8 Jan 2026
- creditEvan Chan, Daniel Yudelevich
Introduced: 8 Jan 2026
NewCVE-2026-21874 (opens in a new tab)How to fix?
Upgrade nicegui to version 3.5.0 or higher.
Overview
nicegui is a Create web-based user interfaces with Python. The nice way.
Affected versions of this package are vulnerable to Missing Release of Resource after Effective Lifetime in the handle_disconnect() function, when using the Redis backend for tab storage. An attacker can cause service degradation and loss of persistent storage functionality by repeatedly opening and closing browser tabs, which exhausts available Redis connections.