{"id":"CVE-2023-31125","aliases":["GHSA-q9mw-68c2-j6m5"],"url":"https://o3.security/vulnerability/CVE-2023-31125","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. An uncaught exception vulnerability was introduced in version 5.1.0 and included in version 4.1.0 of the `socket.io` parent package. Older versions are not impacted. 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, including those who use depending packages like `socket.io`. This issue was fixed in version 6.4.2 of Engine.IO. There is no known workaround except upgrading to a safe version.","published":"2023-05-08T20:21:01.341Z","modified":"2026-07-15T01:49:10.265083638Z","cvss":{"score":6.5,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"npm","name":"engine.io","fixedVersion":"6.4.2"}],"fix":{"url":"https://github.com/socketio/engine.io/commit/fc480b4f305e16fe5972cf337d055e598372dc44","label":"socketio/engine.io@fc480b4"},"references":[{"type":"WEB","url":"https://github.com/socketio/engine.io/releases/tag/6.4.2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/31xxx/CVE-2023-31125.json"},{"type":"ADVISORY","url":"https://github.com/socketio/engine.io/security/advisories/GHSA-q9mw-68c2-j6m5"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2023-31125"},{"type":"ADVISORY","url":"https://security.netapp.com/advisory/ntap-20230622-0002/"},{"type":"FIX","url":"https://github.com/socketio/engine.io/commit/fc480b4f305e16fe5972cf337d055e598372dc44"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-07-15T01:49:10.265083638Z"}}