CVE-2018-10199: Mruby

Critical severity, CVSS 9.8. EPSS: 2.3% chance of exploitation in the next 30 days.

In versions of mruby up to and including 1.4.0, a use-after-free vulnerability exists in src/io.c::File#initilialize_copy(). An attacker that can cause Ruby code to be run can possibly use this to execute arbitrary code.

Affected products

• Mruby Mruby: up to and including 1.4.0

Published 2018-04-18. Last modified 2026-06-17.