CVE-2011-3186
actionpack CRLF injection vulnerability
CVE-2011-3186 is a medium vulnerability (CVSS 4.3) in Rubyonrails Rails, published August 29, 2011. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.75%, the 77th percentile. Fixed in actionpack 2.3.13.
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
Exploit likelihood
What each source reports
NVD Score used
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
CVE-2011-3186- CVSS 2.0
- 4.3 Medium
AV:N/AC:M/Au:N/C:N/I:P/A:N - Weakness
- CWE-94
- Updated
- 2026-11-02
CVE List No score
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
CVE-2011-3186- Updated
- 2026-11-02
EUVDEUVD-2017-0225 No score
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
EUVD-2017-0225- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-fcqf-h4h4-695m No score
actionpack CRLF injection vulnerability
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
GHSA-fcqf-h4h4-695m- Weakness
- CWE-94
- Updated
- 2026-11-02
OSV No score
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
CVE-2011-3186- Updated
- 2026-11-02
OSVDEBIAN-CVE-2011-3186 No score
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
DEBIAN-CVE-2011-3186- Updated
- 2026-11-02
OSVGHSA-fcqf-h4h4-695m No score
actionpack CRLF injection vulnerability
CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on Rails 2.3.x before 2.3.13 allows remote attackers to inject arbitrary HTTP headers and conduct HTTP response splitting attacks via the Content-Type header.
- Record
GHSA-fcqf-h4h4-695m- Weakness
- CWE-94
- Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
actionpackRubyGems |
2.3.0 up to 2.3.13 | 2.3.13 |
railsDebian:12 |
before 2.3.14 | 2.3.14 |
railsDebian:13 |
before 2.3.14 | 2.3.14 |
railsDebian:14 |
before 2.3.14 | 2.3.14 |
railsDebian:6.0 |
before 2.3.5-1.2+squeeze1, plus listed versions 2.3.5-1.22.3.5-1.2+squeeze0.1 |
2.3.5-1.2+squeeze1 |
railsDebian:5.0 |
before 2.1.0-7+lenny1, plus listed versions 2.1.0-62.1.0-72.1.0-7+lenny0.12.1.0-7+lenny0.2 |
2.1.0-7+lenny1 |
actionpackRubyGems |
2.3.0 up to 2.3.13, plus listed versions 2.3.102.3.112.3.122.3.22.3.3 Show 8 moreShow less2.3.42.3.52.3.62.3.72.3.82.3.8.pre12.3.92.3.9.pre |
2.3.13 |
History
| When | Changed | Sources |
|---|---|---|
| 2026-11-03 | aliases | EUVD |
| 2026-11-02 | created | CVE List, GitHub Advisories, NVD, OSV |
References
openwall.com/lists/oss-security/2011/08/17/1
bugzilla.redhat.com/show_bug.cgi?id=732156
lists.fedoraproject.org/pipermail/package-announce/2011-September/065137.html
debian.org/security/2011/dsa-2301
Show 13 moreShow less
secunia.com/advisories/45921
github.com/rails/rails/commit/11dafeaa7533be26441a63618be93a03869c83a9
groups.google.com/group/rubyonrails-security/msg/bbe342e43abaa78c?dmode=source&output=gplain
nvd.nist.gov/vuln/detail/CVE-2011-3186
web.archive.org/web/20150201000000*/http://secunia.com/advisories/45921
security-tracker.debian.org/tracker/CVE-2011-3186