Regular expression built from user input detected.
- Rule ID: ruby_lang_regex_using_user_input
- Languages: ruby
- Source: regex_using_user_input.yml
Applications should avoid constructing regular expressions from user input. Regular expressions can have exponential worst-case computational complexity, allowing users to trigger this behaviour can result in excessive CPU consumption causing a regular expression denial of service (ReDoS).
❌ Avoid using untrusted or user data when building regular expressions
✅ Specify a timeout when working with regular expressions
Regexp.new(/(a|b)/, timeout: 3)