CVE-2021-32837: Mechanize Project Mechanize

High severity, CVSS 7.5. EPSS: 28.9% chance of exploitation in the next 30 days.

mechanize, a library for automatically interacting with HTTP web servers, contains a regular expression that is vulnerable to regular expression denial of service (ReDoS) prior to version 0.4.6. If a web server responds in a malicious way, then mechanize could crash. Version 0.4.6 has a patch for the issue.

Affected products

• Mechanize Project Mechanize: before 0.4.6 (fixed in 0.4.6)

Published 2023-01-17. Last modified 2026-06-17.