{"cve":"CVE-2011-3186","nvd":{"published":"2011-08-29T18:55:01.643","modified":"2026-06-16T23:32:49.650","status":"Modified","description":"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.","cvss_v4":null,"cvss_v3":null,"cwes":["CWE-94"],"references":["http://groups.google.com/group/rubyonrails-security/msg/bbe342e43abaa78c?dmode=source&output=gplain","http://lists.fedoraproject.org/pipermail/package-announce/2011-September/065137.html","http://secunia.com/advisories/45921","http://www.debian.org/security/2011/dsa-2301","http://www.openwall.com/lists/oss-security/2011/08/17/1"],"products":["rubyonrails:rails"],"source":"nvd","synced_at":"2026-10-19T19:58:50.521460154+00:00"},"epss":{"cve":"CVE-2011-3186","score":0.01748,"percentile":0.77837,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-fcqf-h4h4-695m","url":"https://osv.dev/vulnerability/GHSA-fcqf-h4h4-695m","summary":"actionpack CRLF injection vulnerability","modified":"2024-12-05T05:27:27.352808Z","packages":[{"ecosystem":"RubyGems","name":"actionpack","purl":"pkg:gem/actionpack","ranges":[">=2.3.0 <2.3.13"],"fixed":["2.3.13"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}