{"cve":"CVE-2022-21676","nvd":{"published":"2022-01-12T19:15:09.217","modified":"2026-06-17T04:26:44.410","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-755","CWE-754"],"references":["https://github.com/socketio/engine.io/commit/66f889fc1d966bf5bfa0de1939069153643874ab","https://github.com/socketio/engine.io/commit/a70800d7e96da32f6e6622804ef659ebc58659db","https://github.com/socketio/engine.io/commit/c0e194d44933bd83bf9a4b126fca68ba7bf5098c","https://github.com/socketio/engine.io/releases/tag/4.1.2","https://github.com/socketio/engine.io/releases/tag/5.2.1"],"products":["socket:engine.io"],"source":"nvd","synced_at":"2026-10-19T21:26:33.761856376+00:00"},"epss":{"cve":"CVE-2022-21676","score":0.0276,"percentile":0.86265,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-273r-mgr4-v34f","url":"https://osv.dev/vulnerability/GHSA-273r-mgr4-v34f","summary":"Uncaught Exception in engine.io","modified":"2023-11-08T04:08:07.289618Z","packages":[{"ecosystem":"npm","name":"engine.io","purl":"pkg:npm/engine.io","ranges":[">=4.0.0 <4.1.2"],"fixed":["4.1.2"]},{"ecosystem":"npm","name":"engine.io","purl":"pkg:npm/engine.io","ranges":[">=5.0.0 <5.2.1"],"fixed":["5.2.1"]},{"ecosystem":"npm","name":"engine.io","purl":"pkg:npm/engine.io","ranges":[">=6.0.0 <6.1.1"],"fixed":["6.1.1"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}