{"id":"CVE-2020-36048","aliases":["GHSA-j4f2-536g-r55m"],"url":"https://o3.security/vulnerability/CVE-2020-36048","summary":"Resource exhaustion in engine.io","details":"Engine.IO before 4.0.0 allows attackers to cause a denial of service (resource consumption) via a POST request to the long polling transport.","published":"2021-01-08T00:15:11.093Z","modified":"2026-07-22T03:44:58.371633Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.03237,"percentile":0.87329,"asOf":"2026-08-23"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"engine.io","fixedVersion":"3.6.0"}],"fix":{"url":"https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b","label":"socketio/engine.io@734f9d1"},"references":[{"type":"ADVISORY","url":"https://github.com/bcaller/kill-engine-io"},{"type":"FIX","url":"https://github.com/socketio/engine.io/commit/734f9d1268840722c41219e69eb58318e0b2ac6b"},{"type":"EVIDENCE","url":"https://blog.caller.xyz/socketio-engineio-dos/"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-22T03:44:58.371633Z"}}