CVE-2011-3186

NONECVSS 0.0
0.0
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • No confirmed exploitation signals yet
CISA-KEV: Not listedEPSS: 2%CVSS: —Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
—
EG Score
0.0(none)
EPSS
75.5%
KEV
Not listed

Published

August 29, 2011

Last Modified

April 29, 2026

References (24)

Affected Packages

(1 across 1 ecosystem)
RubyGems(1)
PackageVulnerable rangeFixed inDependents
actionpack2.3.10 ... 2.3.9.pre (13 versions)2.3.13—

Data Freshness Timeline

(refreshed 8× in last 7d / 38× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 104 total refreshes for this CVE.

  1. 2026-07-22 14:03 UTCEPSS rescore
  2. 2026-07-21 15:21 UTCEPSS rescore
  3. 2026-07-20 17:03 UTCEPSS rescore
  4. 2026-07-20 17:03 UTCEPSS rescore
  5. 2026-07-19 02:25 UTCEPSS rescore
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  11. 2026-07-15 01:55 UTCEPSS rescore
  12. 2026-07-13 22:25 UTCEPSS rescore
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  16. 2026-07-08 15:10 UTCEPSS rescore
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  18. 2026-07-06 16:23 UTCEPSS rescore
  19. 2026-07-06 02:19 UTCEPSS rescore
  20. 2026-07-06 02:19 UTCEPSS rescore
  21. 2026-07-05 18:59 UTCOSV refresh
  22. 2026-07-05 02:26 UTCEPSS rescore
  23. 2026-07-04 06:27 UTCEPSS rescore
  24. 2026-07-02 14:01 UTCEPSS rescore
  25. 2026-07-01 15:02 UTCEPSS rescore
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  1. 2026-07-01 15:02 UTCEPSS rescore
  2. 2026-06-30 23:19 UTCEPSS rescore
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  4. 2026-06-28 14:03 UTCEPSS rescore
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  7. 2026-06-27 03:05 UTCEPSS rescore
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  9. 2026-06-25 13:46 UTCEPSS rescore
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  20. 2026-06-18 17:49 UTCEPSS rescore
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  22. 2026-06-17 17:49 UTCEPSS rescore
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  24. 2026-06-17 17:49 UTCEPSS rescore
  25. 2026-06-17 06:13 UTCOSV refresh
  26. 2026-06-16 17:49 UTCEPSS rescore
  27. 2026-06-15 17:44 UTCEPSS rescore
  28. 2026-06-14 23:14 UTCEPSS rescore
  29. 2026-06-14 23:14 UTCEPSS rescore
  30. 2026-06-13 22:57 UTCEPSS rescore
  31. 2026-06-13 22:57 UTCEPSS rescore
  32. 2026-06-12 23:08 UTCEPSS rescore
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  35. 2026-06-10 13:17 UTCEPSS rescore
  36. 2026-06-08 14:14 UTCEPSS rescore
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  38. 2026-06-07 15:22 UTCEPSS rescore
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  40. 2026-06-06 13:45 UTCEPSS rescore
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  42. 2026-06-05 22:44 UTCEPSS rescore
  43. 2026-06-05 06:08 UTCEPSS rescore
  44. 2026-06-05 06:07 UTCEPSS rescore
  45. 2026-06-04 13:09 UTCEPSS rescore
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  47. 2026-06-02 20:10 UTCEPSS rescore
  48. 2026-06-02 20:10 UTCEPSS rescore
  49. 2026-06-01 13:49 UTCEPSS rescore
  50. 2026-06-01 13:49 UTCEPSS rescore
  51. 2026-05-31 22:28 UTCEPSS rescore
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  53. 2026-05-31 00:14 UTCEPSS rescore
  54. 2026-05-31 00:14 UTCEPSS rescore
  55. 2026-05-29 13:41 UTCEPSS rescore
  56. 2026-05-29 13:40 UTCEPSS rescore
  57. 2026-05-29 07:08 UTCEG score recompute
  58. 2026-05-28 13:42 UTCEPSS rescore
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  61. 2026-05-27 13:38 UTCEPSS rescore
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  63. 2026-05-26 13:41 UTCEPSS rescore
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  65. 2026-05-26 07:16 UTCEPSS rescore
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  67. 2026-05-24 16:43 UTCEPSS rescore
  68. 2026-05-22 21:15 UTCEPSS rescore
  69. 2026-05-22 21:15 UTCEPSS rescore
  70. 2026-05-22 21:15 UTCEPSS rescore
  71. 2026-05-22 16:13 UTCOSV refresh
  72. 2026-05-20 22:37 UTCEPSS rescore
  73. 2026-05-20 22:37 UTCEPSS rescore
  74. 2026-05-20 22:37 UTCEPSS rescore
  75. 2026-05-20 11:21 UTCEPSS rescore

Frequently asked(4)

What is CVE-2011-3186?
CVE-2011-3186 is a none vulnerability published on August 29, 2011. 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.
When was CVE-2011-3186 disclosed?
CVE-2011-3186 was first published in the National Vulnerability Database on August 29, 2011, with the most recent update on April 29, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2011-3186 actively exploited?
CVE-2011-3186 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 75.5% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
How do I remediate CVE-2011-3186?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2011-3186, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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