{"id":"CVE-2026-59725","state":"PUBLISHED","title":"Socket.IO: Engine.IO Polling Transport Connection Exhaustion","description":"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.","publishedAt":"2026-07-08T15:37:52.293Z","updatedAt":"2026-10-14T18:46:37.137Z","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 engine.io"],"affected":[{"vendor":"socketio","product":"engine.io","versions":[{"version":">= 4.1.0, < 6.6.7","status":"affected"}]}],"references":["https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x","https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671","https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.7"],"weaknesses":["CWE-404"],"ingestedAt":"2026-10-29T20:12:32.778Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/59xxx/CVE-2026-59725.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-59725","state":"PUBLISHED","datePublished":"2026-07-08T15:37:52.293Z","dateUpdated":"2026-10-14T18:46:37.137Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-07-06T15:34:16.916Z"},"containers":{"cna":{"title":"Socket.IO: Engine.IO Polling Transport Connection Exhaustion","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."}],"affected":[{"vendor":"socketio","product":"engine.io","versions":[{"version":">= 4.1.0, < 6.6.7","status":"affected"}]}],"references":[{"url":"https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x","name":"https://github.com/socketio/socket.io/security/advisories/GHSA-r635-g3xr-vw7x","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671","name":"https://github.com/socketio/socket.io/commit/fc11285e14964c2132d122164bf130c355f60671","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-404","lang":"en","description":"CWE-404: Improper Resource Shutdown or Release","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-14T18:46:37.137Z"},"source":{"advisory":"GHSA-r635-g3xr-vw7x","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-08T16:50:45.800976Z","id":"CVE-2026-59725","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":"2026-07-08T17:00:32.946Z"}}]}}}