CVE-2015-9096: Ruby-Lang Ruby

Medium severity, CVSS 6.1. EPSS: 3.7% chance of exploitation in the next 30 days.

Net::SMTP in Ruby before 2.4.0 is vulnerable to SMTP command injection via CRLF sequences in a RCPT TO or MAIL FROM command, as demonstrated by CRLF sequences immediately before and after a DATA substring.

Affected products

• Ruby-Lang Ruby: up to and including 2.4.0

Published 2017-06-12. Last modified 2026-06-17.