CVE-2020-7663

websocket-extensions ruby module prior to 0.1.5 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-extensionsThird Party Advisory
• https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838bPatch, Third Party Advisory
• https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/08/msg00031.htmlMailing List, Third Party Advisory
• https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830Exploit, Third Party Advisory
• https://usn.ubuntu.com/4502-1/Third Party Advisory
• https://blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensionsThird Party Advisory
• https://github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838bPatch, Third Party Advisory
• https://github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2Third Party Advisory
• https://lists.debian.org/debian-lts-announce/2020/08/msg00031.htmlMailing List, Third Party Advisory
• https://snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830Exploit, Third Party Advisory
• https://usn.ubuntu.com/4502-1/Third Party Advisory

Published

Jun 2, 2020

Last Modified

Jun 17, 2026

Status

Modified

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