Regular Expression Denial of Service in websocket-extensions (RubyGem)

Not analysed yet

We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.

Severity and exploitation

• CISA KEV Not listed.
• EPSS 0.046, the 91st percentile, on 9 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the GitHub Advisory Database, published 5 Jun 2020. New records show when each source confirmed them.

Sources

• GitHub Advisory Database: GHSA-g6wq-qcwm-j5g2
• OSV: GHSA-g6wq-qcwm-j5g2
• github.com/faye/websocket-extensions-ruby/security/advisories/GHSA-g6wq-qcwm-j5g2
• nvd.nist.gov/vuln/detail/CVE-2020-7663
• github.com/faye/websocket-extensions-ruby/commit/aa156a439da681361ed6f53f1a8131892418838b
• blog.jcoglan.com/2020/06/02/redos-vulnerability-in-websocket-extensions
• github.com/faye/websocket-extensions-ruby
• github.com/rubysec/ruby-advisory-db/blob/master/gems/websocket-extensions/CVE-2020-7663.yml
• lists.debian.org/debian-lts-announce/2020/08/msg00031.html
• snyk.io/vuln/SNYK-RUBY-WEBSOCKETEXTENSIONS-570830
• usn.ubuntu.com/4502-1

Facts on this page come from the GitHub Advisory Database (CC-BY 4.0), OSV and the other sources listed, as published. We don’t reproduce full advisory descriptions, which can contain exploit code.