CVE-2011-3186 json
actionpack CRLF injection vulnerability
published 2011-08-29 15 y ago modified 2026-06-16 4 mo ago also GHSA-fcqf-h4h4-695m , EUVD-2017-0225
- cvss
- 4.3
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.7%
- EPSS 1.7% chance of exploitation in 30 days, percentile 77%
- public exploits
- 0
- none known
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.
Patch / fix
- rubygems actionpack 2.3.13
- rails Debian 14, Debian 13, Debian 12 2.3.14
debian advisories DEBIAN-CVE-2011-3186
- github.com/rails/rails@11dafea commit
- openwall.com/lists/oss-security/2011/08/17/1 patch
- openwall.com/lists/oss-security/2011/08/22/13 patch
- bugzilla.redhat.com/show_bug.cgi?id=732156 patch
- openwall.com/lists/oss-security/2011/08/19/11 patch
- openwall.com/lists/oss-security/2011/08/20/1 patch
- openwall.com/lists/oss-security/2011/08/22/5 patch
- groups.google.com/group/rubyonrails-security/msg/bbe342e43abaa78c?dmode=sour… patch
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2011-3186 updated cvss 4.3
rubygem-actionpack: response splitting flaw
-
Red Hat All currently supported Red Hat productsnot affected: vulnerable code not present
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
Exploit prediction
1.75% chance of exploitation in the next 30 days, higher than 77% of all scored CVEs (FIRST EPSS, 2026-11-09).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 4.3 | AV:N/AC:M/Au:N/C:N/I:P/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| rubygems | actionpack | >=2.3.0, <2.3.13 |
2.3.13 |
Classification
- Weakness
-
- CWE-94 Improper Control of Generation of Code
- Technology feeds
References
-
github.com
/rails/rails/commit/11dafeaa7533be26441a63618be93a03869c83a9
web, patch
-
openwall.com
/lists/oss-security/2011/08/17/1
mailing-list, web, patch
-
openwall.com
/lists/oss-security/2011/08/22/13
mailing-list, web, patch
-
bugzilla.redhat.com
/show_bug.cgi?id=732156
web, patch
-
openwall.com
/lists/oss-security/2011/08/19/11
mailing-list, web, patch
-
openwall.com
/lists/oss-security/2011/08/20/1
mailing-list, web, patch
-
openwall.com
/lists/oss-security/2011/08/22/5
mailing-list, web, patch
-
groups.google.com
/group/rubyonrails-security/msg/bbe342e43abaa78c?dmode=source&output=gplain
mailing-list, web, patch
-
lists.fedoraproject.org
/pipermail/package-announce/2011-September/065137.html
vendor-advisory, web
-
debian.org
/security/2011/dsa-2301
vendor-advisory, web
-
secunia.com
/advisories/45921
third-party-advisory
-
openwall.com
/lists/oss-security/2011/08/22/14
mailing-list, web
-
nvd.nist.gov
/vuln/detail/CVE-2011-3186
advisory
-
github.com
/rails/rails
package
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2011-3186.yml
web
-
groups.google.com
/forum/#!topic/rubyonrails-security/b_yTveAph2g
web
-
web.archive.org
/web/20150201000000*/http://secunia.com/advisories/45921
web
Sources
- CVE List CVE-2011-3186
- GitHub Advisory GHSA-fcqf-h4h4-695m
- NVD CVE-2011-3186
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.