{"id":"CVE-2020-7662","details":"websocket-extensions npm module prior to 0.1.4 allows Denial of Service (DoS) via Regex Backtracking. The extension parser may take quadratic time when parsing a header containing an unclosed string parameter value whose content is a repeating two-byte sequence of a backslash and some other character. This could be abused by an attacker to conduct Regex Denial Of Service (ReDoS) on a single-threaded server by providing a malicious payload with the Sec-WebSocket-Extensions header.","aliases":["GHSA-g78m-2chm-r7qv","SNYK-JS-WEBSOCKETEXTENSIONS-570623"],"modified":"2026-07-09T14:43:58.678698Z","published":"2020-06-02T19:15:12.403Z","references":[{"type":"FIX","url":"https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237"},{"type":"EVIDENCE","url":"https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions"},{"type":"EVIDENCE","url":"https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qv"},{"type":"EVIDENCE","url":"https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/faye/websocket-extensions-node","events":[{"introduced":"0"},{"fixed":"5ea0b420804ba6c4219e152b52fd3bdd6d144041"},{"fixed":"29496f6838bfadfe5a2f85dff33ed0ba33873237"}],"database_specific":{"cpe":"cpe:2.3:a:websocket-extensions_project:websocket-extensions:*:*:*:*:*:node.js:*:*","extracted_events":[{"introduced":"0"},{"fixed":"0.1.4"}],"source":["CPE_RANGE","REFERENCES"]}}],"versions":["0.1.3","0.1.2","0.1.1","0.1.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-7662.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}