{"id":"CVE-2020-36049","aliases":["GHSA-xfhh-g9f5-x4m4"],"url":"https://o3.security/vulnerability/CVE-2020-36049","summary":"Resource exhaustion in socket.io-parser","details":"The `socket.io-parser` npm package before versions 3.3.2 and 3.4.1 allows attackers to cause a denial of service (memory consumption) via a large packet because a concatenation approach is used.","published":"2021-01-08T00:15:11.187Z","modified":"2026-10-24T10:48:38.072746724Z","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":0.02589,"percentile":0.84516,"asOf":"2026-09-17"},"cisaKev":null,"exploitsKnown":1,"affectedPackages":[{"ecosystem":"npm","name":"socket.io-parser","fixedVersion":"3.3.2"},{"ecosystem":"npm","name":"socket.io-parser","fixedVersion":"3.4.1"}],"fix":{"url":"https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55","label":"socketio/socket.io-parser@dcb942d"},"references":[{"type":"ADVISORY","url":"https://github.com/bcaller/kill-engine-io"},{"type":"FIX","url":"https://github.com/socketio/socket.io-parser/commit/dcb942d24db97162ad16a67c2a0cf30875342d55"},{"type":"EVIDENCE","url":"https://blog.caller.xyz/socketio-engineio-dos/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2020-36049"},{"type":"WEB","url":"https://blog.caller.xyz/socketio-engineio-dos"},{"type":"WEB","url":"https://github.com/socketio/socket.io-parser/releases/tag/3.3.2"},{"type":"WEB","url":"https://github.com/socketio/socket.io-parser/releases/tag/3.4.1"},{"type":"WEB","url":"https://www.npmjs.com/package/socket.io-parser"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-24T10:48:38.072746724Z"}}