{"id":"CVE-2022-21676","aliases":["GHSA-273r-mgr4-v34f"],"url":"https://o3.security/vulnerability/CVE-2022-21676","summary":"Uncaught Exception in engine.io","details":"Engine.IO is the implementation of transport-based cross-browser/cross-device bi-directional communication layer for Socket.IO. A specially crafted HTTP request can trigger an uncaught exception on the Engine.IO server, thus killing the Node.js process. This impacts all the users of the `engine.io` package starting from version `4.0.0`, including those who uses depending packages like `socket.io`. Versions prior to `4.0.0` are not impacted. A fix has been released for each major branch, namely `4.1.2` for the `4.x.x` branch, `5.2.1` for the `5.x.x` branch, and `6.1.1` for the `6.x.x` branch. There is no known workaround except upgrading to a safe version.","published":"2022-01-12T18:25:15Z","modified":"2026-08-12T03:51:30.306064382Z","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":0.0276,"percentile":0.85528,"asOf":"2026-09-16"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"engine.io","fixedVersion":"4.1.2"},{"ecosystem":"npm","name":"engine.io","fixedVersion":"5.2.1"},{"ecosystem":"npm","name":"engine.io","fixedVersion":"6.1.1"}],"fix":{"url":"https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab","label":"socketio/engine.io@66f889f"},"references":[{"type":"WEB","url":"https://github.com/socketio/engine.io/releases/tag/4.1.2"},{"type":"WEB","url":"https://github.com/socketio/engine.io/releases/tag/5.2.1"},{"type":"WEB","url":"https://github.com/socketio/engine.io/releases/tag/6.1.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/21xxx/CVE-2022-21676.json"},{"type":"ADVISORY","url":"https://github.com/socketio/engine.io/security/advisories/GHSA-273r-mgr4-v34f"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-21676"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20220209-0002/"},{"type":"FIX","url":"https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab"},{"type":"FIX","url":"https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659db"},{"type":"FIX","url":"https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098c"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:30.306064382Z"}}