{"id":"CVE-2026-59725","sourceIdentifier":"security-advisories@github.com","published":"2026-07-08T16:16:33.133","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 4.1.0 before 6.6.7, Engine.IO protocol v4 polling transport does not properly close the HTTP response for invalid binary POST requests with Content-Type: application/octet-stream, allowing an unauthenticated attacker to exhaust server-side connections and sockets. This issue is fixed in version 6.6.7."},{"lang":"es","value":"Socket.IO permite comunicación bidireccional y de baja latencia para cada plataforma. Desde la versión 4.1.0 anterior a la 6.6.7, el transporte de sondeo del protocolo Engine.IO v4 no cierra correctamente la respuesta HTTP para solicitudes POST binarias no válidas con Content-Type: application/octet-stream, permitiendo a un atacante no autenticado agotar las conexiones y los sockets del lado del servidor. Este problema está solucionado en la versión 6.6.7."}],"affected":[{"source":"security-advisories@github.com","affectedData":[{"vendor":"socketio","product":"engine.io","versions":[{"version":">= 4.1.0, < 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":"2026-07-08T16:50:45.800976Z","id":"CVE-2026-59725","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-404"}]}],"configurations":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:a:socket:engine.io:*:*:*:*:*:node.js:*:*","versionStartIncluding":"4.1.0","versionEndExcluding":"6.6.7","matchCriteriaId":"E891F735-E7C3-41E7-9B17-D0D3D2D6E299"}]}]}],"references":[{"url":"https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671","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-r635-g3xr-vw7x","source":"security-advisories@github.com","tags":["Patch","Vendor Advisory"]}]}