{"id":"EUVD-2026-100462","revision":"05b7aab4a0df47219c20e71ec2515cc7","records":[{"revision":"05b7aab4a0df47219c20e71ec2515cc7","observedAt":"2026-11-09T05:03:28.006+00:00","statement":{"source":"euvd","id":"EUVD-2026-100462","aliases":["CVE-2026-102599","GHSA-2gc4-cqfq-p2gv"],"title":"Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing t…","description":"Socket.IO enables bidirectional and low-latency communication for every platform. From Engine.IO 6.6.0 until 6.6.10, a transport upgrade can independently derive an Engine.IO protocol revision from the upgrade request instead of enforcing the revision stored on the existing session. A malicious client can establish a valid session and send an upgrade request with a different or omitted EIO query parameter, attaching a transport with incompatible parser and heartbeat behavior. A crafted heartbeat packet can then trigger an uncaught exception and terminate the Node.js process, including when Engine.IO v3 compatibility is disabled because an omitted EIO value is interpreted as revision 3 on the affected path. This issue is fixed in Engine.IO 6.6.10.","state":0,"publishedAt":null,"modifiedAt":null,"affected":[],"metrics":[{"system":"EUVD CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":null}],"references":["https://github.com/socketio/socket.io/security/advisories/GHSA-2gc4-cqfq-p2gv","https://github.com/socketio/socket.io/commit/86db1fc3db2cd315a065d64c4e48918ccf9b4729","https://github.com/socketio/socket.io/releases/tag/engine.io@6.6.10"],"sourceUrl":"https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-100462","license":"ENISA EUVD · source terms and attribution apply","enrichment":{"sourceStatus":null,"weaknesses":[],"productCriteria":[],"sourceDates":{"datePublished":"Oct 13, 2026, 7:05:10 PM","dateUpdated":"Oct 17, 2026, 12:39:46 AM"},"relatedAdvisories":[],"note":"EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON."},"key":"euvd:EUVD-2026-100462","identifiers":["EUVD-2026-100462","CVE-2026-102599","GHSA-2gc4-cqfq-p2gv"]},"retained":false,"historicalAffected":[]}],"coverage":[]}