CVE-2022-28738: Ruby-Lang Ruby

Critical severity, CVSS 9.8. EPSS: 3% chance of exploitation in the next 30 days.

A double free was found in the Regexp compiler in Ruby 3.x before 3.0.4 and 3.1.x before 3.1.2. If a victim attempts to create a Regexp from untrusted user input, an attacker may be able to write to unexpected memory locations.

Affected products

• Ruby-Lang Ruby: from 3.0.0, before 3.0.4 (fixed in 3.0.4); from 3.1.0, before 3.1.2 (fixed in 3.1.2)

Published 2022-05-09. Last modified 2026-06-17.