{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59724","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-07-06T15:34:16.916Z","datePublished":"2026-07-08T15:35:39.813Z","dateUpdated":"2026-07-08T19:41:18.905Z"},"containers":{"cna":{"title":"Socket.IO: Engine.IO WebTransport SID DoS","problemTypes":[{"descriptions":[{"cweId":"CWE-20","lang":"en","description":"CWE-20: Improper Input Validation","type":"CWE"}]}],"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"}}],"references":[{"name":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","tags":["x_refsource_CONFIRM"],"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3"},{"name":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c"},{"name":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7","tags":["x_refsource_MISC"],"url":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7"}],"affected":[{"vendor":"socketio","product":"socket.io","versions":[{"version":">= 6.5.0, < 6.6.7","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-08T15:35:39.813Z"},"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."}],"source":{"advisory":"GHSA-gr94-w7qr-f4j3","discovery":"UNKNOWN"}},"adp":[{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-08T19:41:18.905Z"}}]}}