CVE-2022-1212: Mruby

Critical severity, CVSS 9.8. EPSS: 1.8% chance of exploitation in the next 30 days.

Use-After-Free in str_escape in mruby/mruby in GitHub repository mruby/mruby prior to 3.2. Possible arbitrary code execution if being exploited.

Affected products

• Mruby Mruby: up to and including 3.0.0; version 3.1.0 only

Published 2022-04-05. Last modified 2026-06-17.