{"id":"CVE-2026-21874","state":"PUBLISHED","title":"NiceGUI has Redis connection leak via tab storage causes service degradation","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.","publishedAt":"2026-01-08T09:50:47.247Z","updatedAt":"2026-01-08T14:43:50.018Z","severity":{"score":5.3,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","source":"GitHub_M"},"assigner":"GitHub_M","products":["zauberzeug nicegui"],"affected":[{"vendor":"zauberzeug","product":"nicegui","versions":[{"version":">= 2.10.0, < 3.5.0","status":"affected"}]}],"references":["https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2","https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83","https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0"],"weaknesses":["CWE-772"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/21xxx/CVE-2026-21874.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-21874","state":"PUBLISHED","datePublished":"2026-01-08T09:50:47.247Z","dateUpdated":"2026-01-08T14:43:50.018Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-01-05T16:44:16.369Z"},"containers":{"cna":{"title":"NiceGUI has Redis connection leak via tab storage causes service degradation","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."}],"affected":[{"vendor":"zauberzeug","product":"nicegui","versions":[{"version":">= 2.10.0, < 3.5.0","status":"affected"}]}],"references":[{"url":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2","name":"https://github.com/zauberzeug/nicegui/security/advisories/GHSA-mp55-g7pj-rvm2","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83","name":"https://github.com/zauberzeug/nicegui/commit/6c52eb2c90c4b67387c025b29646b4bc1578eb83","tags":["x_refsource_MISC"]},{"url":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0","name":"https://github.com/zauberzeug/nicegui/releases/tag/v3.5.0","tags":["x_refsource_MISC"]}],"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"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-772","lang":"en","description":"CWE-772: Missing Release of Resource after Effective Lifetime","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-01-08T09:50:47.247Z"},"source":{"advisory":"GHSA-mp55-g7pj-rvm2","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","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"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-01-08T14:43:50.018Z"}}]}}}