{"id":"CVE-2026-59724","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T16:16:32.980","lastModified":"2026-10-25T20:10:00.147","vulnStatus":"Analyzed","cveTags":[],"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."},{"lang":"es","value":"Socket.IO permite la comunicación bidireccional y de baja latencia para todas las plataformas. Desde la versión 6.5.0 hasta la 6.6.7, los servidores de Engine.IO con WebTransport habilitado pueden resolver un ID de sesión manipulado, como __proto__, a través de una propiedad heredada del objeto clients durante el manejo de la actualización de WebTransport, causando un TypeError y denegación de servicio. Este problema se corrige en la versión 6.6.7."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"socketio","product":"socket.io","versions":[{"version":">= 6.5.0, < 6.6.7","status":"affected"}]}]}],"metrics":{"cvssMetricV31":[{"source":"security-advisories@github.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","baseScore":7.5,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"NONE","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"HIGH"},"exploitabilityScore":3.9,"impactScore":3.6}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-07-08T17:58:43.578991Z","id":"CVE-2026-59724","options":[{"exploitation":"none"},{"automatable":"yes"},{"technicalImpact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"weaknesses":[{"source":"security-advisories@github.com","type":"Secondary","description":[{"lang":"en","value":"CWE-20"}]},{"source":"nvd@nist.gov","type":"Primary","description":[{"lang":"en","value":"NVD-CWE-noinfo"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:*","versionStartIncluding":"6.5.0","versionEndExcluding":"6.6.7","matchCriteriaId":"96612FDE-E815-461C-9ABA-08B2979A8698"}]}]}],"references":[{"url":"https://github.com/socketio/socket.io/commit/1fa1f46cd420ac5b57bb4c04c959b58f3c79158c","source":"security-advisories@github.com","tags":["Patch"]},{"url":"https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7","source":"security-advisories@github.com","tags":["Release Notes"]},{"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-gr94-w7qr-f4j3","source":"security-advisories@github.com","tags":["Patch","Vendor Advisory","Mitigation"]}]}