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.

References

• https://nvd.nist.gov/vuln/detail/CVE-2022-28738
• https://hackerone.com/reports/1220911
• https://security-tracker.debian.org/tracker/CVE-2022-28738
• https://www.ruby-lang.org/en/news/2022/04/12/double-free-in-regexp-compilation-cve-2022-28738/
• https://security.netapp.com/advisory/ntap-20220624-0002/
• https://security.gentoo.org/glsa/202401-27