Medium severity5.3OSV Advisory· Published Jan 8, 2026· Updated Jun 17, 2026
CVE-2026-21874
CVE-2026-21874
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
niceguiPyPI | >= 2.10.0, < 3.5.0 | 3.5.0 |
Affected products
3v2.10.0, v2.10.1, v2.11.0, …+ 1 more
- (no CPE)range: v2.10.0, v2.10.1, v2.11.0, …
- cpe:2.3:a:zauberzeug:nicegui:*:*:*:*:*:*:*:*range: >=2.10.0,<3.5.0
Patches
Vulnerability mechanics
References
5- github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83nvdPatchWEB
- github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2nvdExploitVendor AdvisoryWEB
- github.com/advisories/GHSA-mp55-g7pj-rvm2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-21874ghsaADVISORY
- github.com/zauberzeug/nicegui/releases/tag/v3.5.0nvdRelease NotesWEB
News mentions
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