CVE-2020-7662

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.

• https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsExploit, Third Party Advisory
• https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237Patch, Third Party Advisory
• https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qvExploit, Third Party Advisory
• https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623Exploit, Technical Description, Third Party Advisory
• https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsExploit, Third Party Advisory
• https://github.com/faye/websocket-extensions-node/commit/29496f6838bfadfe5a2f85dff33ed0ba33873237Patch, Third Party Advisory
• https://github.com/faye/websocket-extensions-node/security/advisories/GHSA-g78m-2chm-r7qvExploit, Third Party Advisory
• https://snyk.io/vuln/SNYK-JS-WEBSOCKETEXTENSIONS-570623Exploit, Technical Description, Third Party Advisory

Published

Jun 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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