CVE-2020-6839: Mruby

Critical severity, CVSS 9.8. EPSS: 1.4% chance of exploitation in the next 30 days.

In mruby 2.1.0, there is a stack-based buffer overflow in mrb_str_len_to_dbl in string.c.

Affected products

• Mruby Mruby: version 2.1.0 only

Published 2020-01-11. Last modified 2026-06-17.