{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-21874",
        "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "state": "PUBLISHED",
        "assignerShortName": "GitHub_M",
        "dateReserved": "2026-01-05T16:44:16.369Z",
        "datePublished": "2026-01-08T09:50:47.247Z",
        "dateUpdated": "2026-01-08T14:43:50.018Z"
    },
    "containers": {
        "cna": {
            "title": "NiceGUI has Redis connection leak via tab storage causes service degradation",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-772",
                            "lang": "en",
                            "description": "CWE-772: Missing Release of Resource after Effective Lifetime",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "metrics": [
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "NETWORK",
                        "availabilityImpact": "LOW",
                        "baseScore": 5.3,
                        "baseSeverity": "MEDIUM",
                        "confidentialityImpact": "NONE",
                        "integrityImpact": "NONE",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "NONE",
                        "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L",
                        "version": "3.1"
                    }
                }
            ],
            "references": [
                {
                    "name": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2",
                    "tags": [
                        "x_refsource_CONFIRM"
                    ],
                    "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2"
                },
                {
                    "name": "https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83"
                },
                {
                    "name": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0",
                    "tags": [
                        "x_refsource_MISC"
                    ],
                    "url": "https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"
                }
            ],
            "affected": [
                {
                    "vendor": "zauberzeug",
                    "product": "nicegui",
                    "versions": [
                        {
                            "version": ">= 2.10.0, < 3.5.0",
                            "status": "affected"
                        }
                    ]
                }
            ],
            "providerMetadata": {
                "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
                "shortName": "GitHub_M",
                "dateUpdated": "2026-01-08T09:50:47.247Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "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."
                }
            ],
            "source": {
                "advisory": "GHSA-mp55-g7pj-rvm2",
                "discovery": "UNKNOWN"
            }
        },
        "adp": [
            {
                "references": [
                    {
                        "url": "https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2",
                        "tags": [
                            "exploit"
                        ]
                    }
                ],
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-01-08T14:43:46.386940Z",
                                "id": "CVE-2026-21874",
                                "options": [
                                    {
                                        "Exploitation": "poc"
                                    },
                                    {
                                        "Automatable": "yes"
                                    },
                                    {
                                        "Technical Impact": "partial"
                                    }
                                ],
                                "role": "CISA Coordinator",
                                "version": "2.0.3"
                            }
                        }
                    }
                ],
                "title": "CISA ADP Vulnrichment",
                "providerMetadata": {
                    "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
                    "shortName": "CISA-ADP",
                    "dateUpdated": "2026-01-08T14:43:50.018Z"
                }
            }
        ]
    }
}