CVE-2015-9097

The mail gem before 2.5.5 for Ruby (aka A Really Ruby Mail Library) 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.

• CWE-93

• http://openwall.com/lists/oss-security/2015/12/11/3Mailing List, Third Party Advisory
• http://www.mbsd.jp/Whitepaper/smtpi.pdfThird Party Advisory
• https://github.com/mikel/mail/commit/72befdc4dab3e6e288ce226a7da2aa474cf5be83Exploit, Third Party Advisory
• https://github.com/mikel/mail/pull/1097Issue Tracking, Third Party Advisory
• https://github.com/rubysec/ruby-advisory-db/issues/215Issue Tracking, Third Party Advisory
• https://hackerone.com/reports/137631Issue Tracking, Third Party Advisory
• https://rubysec.com/advisories/mail-OSVDB-131677Issue Tracking, Vendor Advisory
• http://openwall.com/lists/oss-security/2015/12/11/3Mailing List, Third Party Advisory
• http://www.mbsd.jp/Whitepaper/smtpi.pdfThird Party Advisory
• https://github.com/mikel/mail/commit/72befdc4dab3e6e288ce226a7da2aa474cf5be83Exploit, Third Party Advisory
• https://github.com/mikel/mail/pull/1097Issue Tracking, Third Party Advisory
• https://github.com/rubysec/ruby-advisory-db/issues/215Issue Tracking, Third Party Advisory
• https://hackerone.com/reports/137631Issue Tracking, Third Party Advisory
• https://rubysec.com/advisories/mail-OSVDB-131677Issue Tracking, Vendor Advisory

Published

Jun 12, 2017

Last Modified

Jun 17, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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