NiceGUI has Redis connection leak via tab storage causes service degradation_CVE-2026-21874

{
    "lastseen": "",
    "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.",
    "published": "2026-01-08T09:50:47.247Z",
    "modified": "2026-01-08T09:50:47.247Z",
    "type": "cve",
    "title": "NiceGUI has Redis connection leak via tab storage causes service degradation",
    "source": "GitHub_M",
    "references": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2\nhttps://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83\nhttps://github.com/zauberzeug/nicegui/releases/tag/v3.5.0",
    "id": "CVE-2026-21874",
    "bulletinFamily": "",
    "cwe": [
        "CWE-772"
    ],
    "cvelist": null,
    "sourceData": "zauberzeug nicegui >= 2.10.0, < 3.5.0",
    "sourceHref": "",
    "cvss": {
        "score": 5.3,
        "severity": "MEDIUM",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "nicegui",
    "version": ">= 2.10.0, < 3.5.0",
    "vendor": "zauberzeug",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}