CVE-2015-9097
Mail Gem CRLF Injection vulnerability
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- Low
- Integrity
- Low
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2015-9097- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-93
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2015-9097- Updated
- 2026-11-02
EUVDEUVD-2017-0290 No score
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.
- Record
EUVD-2017-0290- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-q86f-fmqf-qrf6
Mail Gem CRLF Injection vulnerability
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.
- Record
GHSA-q86f-fmqf-qrf6- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-93
- Updated
- 2026-11-02
OSV
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.
- Record
CVE-2015-9097- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVDEBIAN-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.
- Record
DEBIAN-CVE-2015-9097- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
OSVGHSA-q86f-fmqf-qrf6
Mail Gem CRLF Injection vulnerability
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.
- Record
GHSA-q86f-fmqf-qrf6- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Weakness
- CWE-93
- Updated
- 2026-11-02
OSVUBUNTU-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.
- Record
UBUNTU-CVE-2015-9097- CVSS 3.0
- 6.1 Medium
CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
mailRubyGems |
before 2.5.5 | 2.5.5 |
ruby-mailDebian:12 |
before 2.6.1+dfsg1-1 | 2.6.1+dfsg1-1 |
ruby-mailDebian:13 |
before 2.6.1+dfsg1-1 | 2.6.1+dfsg1-1 |
ruby-mailDebian:14 |
before 2.6.1+dfsg1-1 | 2.6.1+dfsg1-1 |
ruby-mailDebian:7 |
before 2.4.4-2+deb7u1, plus listed versions 2.4.4-2 |
2.4.4-2+deb7u1 |
mailRubyGems |
before 2.5.5, plus listed versions 1.0.01.1.01.2.11.2.51.2.6 Show 45 moreShow less1.2.81.2.91.3.01.3.11.3.21.3.31.3.41.3.51.4.01.4.11.4.21.4.31.5.01.5.11.5.21.5.31.5.41.6.02.0.32.0.52.1.02.1.12.1.22.1.32.1.52.1.5.12.1.5.22.1.5.32.2.02.2.12.2.102.2.112.2.122.2.132.2.142.2.152.2.162.2.172.2.182.2.192.2.22.2.202.2.32.2.42.2.5 |
2.5.5 |
History
| Recorded | Changed | Sources |
|---|---|---|
| affected | ||
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2015-9097 is a medium vulnerability (CVSS 6.1) in Mail Project Mail, published May 25, 2016. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.40%, the 88th percentile. Fixed in mail 2.5.5.
References
Left out here: 18 versions. The JSON record has them.