CRLF injection vulnerability in actionpack/lib/action_controller/response.rb in Ruby on…
Priority LOW 24CWE-94Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Medium
- Impact type
- Code execution
- Confidentiality · integrity · availability
- None · Partial · None
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-94.
Summary
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.
Why it matters now
EPSS 0.01748 77th percentileScored 2026-11-07
Fix Fixed actionpack (RubyGems): 2.3.13
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | actionpack (RubyGems) | 2.3.0 to before 2.3.13 | 2.3.13 | Patch available | GHSA-fcqf-h4h4-695m |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- actionpack (RubyGems) Vendor— Affected 2.3.0 to before 2.3.13 Fixed in 2.3.13 Patch available GHSA-fcqf-h4h4-695m
CPE configurations NVD · 7
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rubyonrails:rails:2.3.2:*:*:*:*:*:*:* | 2.3.2 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.3:*:*:*:*:*:*:* | 2.3.3 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.4:*:*:*:*:*:*:* | 2.3.4 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.9:*:*:*:*:*:*:* | 2.3.9 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.10:*:*:*:*:*:*:* | 2.3.10 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.11:*:*:*:*:*:*:* | 2.3.11 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.3.12:*:*:*:*:*:*:* | 2.3.12 | Vulnerable | Rails |
- cpe:2.3:a:rubyonrails:rails:2.3.2:*:*:*:*:*:*:* Versions 2.3.2 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.3:*:*:*:*:*:*:* Versions 2.3.3 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.4:*:*:*:*:*:*:* Versions 2.3.4 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.9:*:*:*:*:*:*:* Versions 2.3.9 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.10:*:*:*:*:*:*:* Versions 2.3.10 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.11:*:*:*:*:*:*:* Versions 2.3.11 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.3.12:*:*:*:*:*:*:* Versions 2.3.12 Vulnerable ·Rails
Remediation
- Fix · GHSA-fcqf-h4h4-695m actionpack (RubyGems) Fixed in 2.3.13 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2011-3186
- 2026-10-03 Alias added: GHSA-fcqf-h4h4-695m
References
Patch 8
- [oss-security] 20110817 CVE request: ruby on rails flaws (4)
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4)
- https://bugzilla.redhat.com/show_bug.cgi?id=732156
- [oss-security] 20110819 Re: CVE request: ruby on rails flaws (4)
- [oss-security] 20110820 Re: CVE request: ruby on rails flaws (4)
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4)
- https://github.com/rails/rails/commit/11dafeaa7533be26441a63618be93a03869c83a9
- [rubyonrails-security] 20110816 Response Splitting Vulnerability in Ruby on Rails
Other 5
- [oss-security] 20110822 Re: CVE request: ruby on rails flaws (4)
- https://github.com/rails/rails
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2011-3186.yml
- https://groups.google.com/forum/#!topic/rubyonrails-security/b_yTveAph2g
- https://web.archive.org/web/20150201000000*/http://secunia.com/advisories/45921
More Rails vulnerabilities
- TI-2014-00124 Directory traversal vulnerability in actionpack/lib/abstract_controller/base.rb in the… KEVCVSS 3.1HIGH 7.5
- TI-2019-03828 Path traversal in Rails https://github.com/rails/rails KEVCVSS 3.1HIGH 7.5
- TI-2016-00672 Directory traversal vulnerability in Action View in Ruby on Rails before 3.2.22.1, 4.0.x… KEVCVSS 3.1HIGH 7.5
- TI-2019-03830 Command injection in Rails https://github.com/rails/rails CVSS 3.1CRITICAL 9.8
- TI-2020-06581 Code injection in https://github.com/rails/rails CVSS 3.1HIGH 8.8
- TI-2013-00091 active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before… CVSS 2.0HIGH 7.5
Sources
- CVE-2011-3186 · CVE Program
- CVE-2011-3186 · NVD
- FIRST EPSS
- GHSA-fcqf-h4h4-695m · GitHub Advisory Database · CC BY 4.0
- CVE-2011-3186 · Red Hat security data · CC BY 4.0
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