{"id":"CVE-2026-59724","state":"PUBLISHED","title":"Socket.IO: Engine.IO WebTransport SID DoS","description":"Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7.","publishedAt":"2026-07-08T15:35:39.813Z","updatedAt":"2026-07-08T19:41:18.905Z","severity":{"score":7.5,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["socketio socket.io"],"affected":[{"vendor":"socketio","product":"socket.io","versions":[{"version":">= 6.5.0, < 6.6.7","status":"affected"}]}],"references":["https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7"],"weaknesses":["CWE-20"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59724.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59724","state":"PUBLISHED","datePublished":"2026-07-08T15:35:39.813Z","dateUpdated":"2026-07-08T19:41:18.905Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-06T15:34:16.916Z"},"containers":{"cna":{"title":"Socket.IO: Engine.IO WebTransport SID DoS","descriptions":[{"lang":"en","value":"Socket.IO enables bidirectional and low-latency communication for every platform. From 6.5.0 before 6.6.7, Engine.IO servers with WebTransport enabled can resolve a crafted session ID such as __proto__ through an inherited property of the clients object during WebTransport upgrade handling, causing a TypeError and denial of service. This issue is fixed in version 6.6.7."}],"affected":[{"vendor":"socketio","product":"socket.io","versions":[{"version":">= 6.5.0, < 6.6.7","status":"affected"}]}],"references":[{"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","name":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","name":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","tags":["x_refsource_MISC"]},{"url":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7","name":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","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:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-07-08T15:35:39.813Z"},"source":{"advisory":"GHSA-gr94-w7qr-f4j3","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-08T17:58:43.578991Z","id":"CVE-2026-59724","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-07-08T19:41:18.905Z"}}]}}}