Python
CVE-2026-21874
MEDIUM
GHSA-mp55-g7pj-rvm2
Severity by source
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Lifecycle Timeline
4DescriptionGitHub Advisory
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.
AnalysisAI
NiceGUI versions 2.10.0 through 3.4.1 fail to properly release Redis connections when users open and close browser tabs, allowing unauthenticated attackers to exhaust the Redis connection pool and degrade service functionality. An attacker can repeatedly trigger connection leaks without authentication, causing storage errors and degraded performance once connection limits are reached. …
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Vulnerability AssessmentAI
| Risk Assessment | CVSS 5.3 (MEDIUM). … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker without authentication could exploit this flaw, service degradation when Redis hits its connection limit. |
| Remediation | A vendor patch is available — apply it immediately. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. …
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External POC / Exploit Code
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