CVE-2013-4073: Ruby-Lang Ruby

Medium severity, CVSS 6.8. EPSS: 2.8% chance of exploitation in the next 30 days.

The OpenSSL::SSL.verify_certificate_identity function in lib/openssl/ssl.rb in Ruby 1.8 before 1.8.7-p374, 1.9 before 1.9.3-p448, and 2.0 before 2.0.0-p247 does not properly handle a '\0' character in a domain name in the Subject Alternative Name field of an X.509 certificate, which allows man-in-the-middle attackers to spoof arbitrary SSL servers via a crafted certificate issued by a legitimate Certification Authority, a related issue to CVE-2009-2408.

Affected products

• Ruby-Lang Ruby: version 1.8.6-26 only; version 1.8.7 only; version 1.9.3 only; version 2.0.0 only

Published 2013-08-18. Last modified 2026-06-16.