A certain algorithm in Ruby on Rails 2.1.0 through 2.2.2, and 2.3.x before 2.3.4, leaks…
Priority LOW 27CWE-200Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- — Not recorded in CVSS 2.0
- Attack complexity
- Low
- Impact type
- Information disclosure
- Confidentiality · integrity · availability
- Partial · None · None
- Fix status
- Fixed
Attack profile from CVSS 2.0 · NVD. Fix status from CNA and GitHub. Impact type from CWE-200.
Summary
A certain algorithm in Ruby on Rails 2.1.0 through 2.2.2, and 2.3.x before 2.3.4, leaks information about the complexity of message-digest signature verification in the cookie store, which might allow remote attackers to forge a digest via multiple attempts.
Why it matters now
EPSS 0.02232 82nd percentileScored 2026-11-07
Fix Fixed actionpack (RubyGems): 2.2.3, 2.3.4activesupport (RubyGems): 2.2.3, 2.3.4
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) | 2.1.0 to before 2.2.3 | 2.2.3 | Patch available | GHSA-fg9w-g6m4-557j |
| — | actionpack (RubyGems) | 2.3.0 to before 2.3.4 | 2.3.4 | Patch available | GHSA-fg9w-g6m4-557j |
| — | activesupport (RubyGems) | 2.1.0 to before 2.2.3 | 2.2.3 | Patch available | GHSA-fg9w-g6m4-557j |
| — | activesupport (RubyGems) | 2.3.0 to before 2.3.4 | 2.3.4 | Patch available | GHSA-fg9w-g6m4-557j |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- actionpack (RubyGems) Vendor— Affected 2.1.0 to before 2.2.3 Fixed in 2.2.3 Patch available GHSA-fg9w-g6m4-557j
- actionpack (RubyGems) Vendor— Affected 2.3.0 to before 2.3.4 Fixed in 2.3.4 Patch available GHSA-fg9w-g6m4-557j
- activesupport (RubyGems) Vendor— Affected 2.1.0 to before 2.2.3 Fixed in 2.2.3 Patch available GHSA-fg9w-g6m4-557j
- activesupport (RubyGems) Vendor— Affected 2.3.0 to before 2.3.4 Fixed in 2.3.4 Patch available GHSA-fg9w-g6m4-557j
CPE configurations NVD · 8
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:rubyonrails:rails:2.1.0:*:*:*:*:*:*:* | 2.1.0 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:* | 2.1.1 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:* | 2.1.2 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:* | 2.2.0 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:* | 2.2.1 | Vulnerable | Rails |
| cpe:2.3:a:rubyonrails:rails:2.2.2:*:*:*:*:*:*:* | 2.2.2 | Vulnerable | Rails |
| 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:2.1.0:*:*:*:*:*:*:* Versions 2.1.0 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:* Versions 2.1.1 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:* Versions 2.1.2 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:* Versions 2.2.0 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:* Versions 2.2.1 Vulnerable ·Rails
- cpe:2.3:a:rubyonrails:rails:2.2.2:*:*:*:*:*:*:* Versions 2.2.2 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
Remediation
- Fix · GHSA-fg9w-g6m4-557j actionpack (RubyGems) Fixed in 2.2.3 Advisory →
- Fix · GHSA-fg9w-g6m4-557j actionpack (RubyGems) Fixed in 2.3.4 Advisory →
- Fix · GHSA-fg9w-g6m4-557j activesupport (RubyGems) Fixed in 2.2.3 Advisory →
- Fix · GHSA-fg9w-g6m4-557j activesupport (RubyGems) Fixed in 2.3.4 Advisory →
Vendor assessments
Timeline
- 2026-10-02 Threatist record created from CVE-2009-3086
- 2026-10-03 Alias added: GHSA-fg9w-g6m4-557j
References
Other 9
- https://github.com/rails/rails/commit/1f07a89c5946910fc28ea5ccd1da6af8a0f972a0
- https://github.com/rails/rails/commit/674f780d59a5a7ec0301755d43a7b277a3ad2978
- https://github.com/rails/rails/commit/d460c9a25560f43e7c3789abadf7b455053eb686
- https://github.com/rails/rails
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2009-3086.yml
- https://github.com/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2009-3086.yml
- https://web.archive.org/web/20090906010200/http://www.vupen.com/english/advisories/2009/2544
- https://web.archive.org/web/20090907001716/http://secunia.com/advisories/36600
- https://web.archive.org/web/20200229150042/http://www.securityfocus.com/bid/37427
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-2009-3086 · CVE Program
- CVE-2009-3086 · NVD
- FIRST EPSS
- GHSA-fg9w-g6m4-557j · GitHub Advisory Database · CC BY 4.0
- CVE-2009-3086 · Red Hat security data · CC BY 4.0
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