CVE-2009-3086 json
actionpack and activesupport vulnerable to information leaks
published 2009-09-08 17 y ago modified 2026-06-16 4 mo ago also GHSA-fg9w-g6m4-557j , EUVD-2017-0227
- cvss
- 5.0
- version 2.0, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 2.2%
- EPSS 2.2% chance of exploitation in 30 days, percentile 82%
- public exploits
- 0
- none known
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.
Patch / fix
- rubygems actionpack 2.2.3, 2.3.4
- rubygems activesupport 2.2.3, 2.3.4
- rails Debian 14, Debian 13, Debian 12 2.2.3-1
debian advisories DEBIAN-CVE-2009-3086
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-2009-3086 updated cvss 5.0
rubygem-actionpack: Message digest forgery
-
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
2.23% chance of exploitation in the next 30 days, higher than 82% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 2.0 | 5.0 | AV:N/AC:L/Au:N/C:P/I:N/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| rubygems | actionpack | >=2.1.0, <2.2.3 >=2.3.0, <2.3.4 |
2.2.3 2.3.4 |
| rubygems | activesupport | >=2.1.0, <2.2.3 >=2.3.0, <2.3.4 |
2.2.3 2.3.4 |
Classification
- Weakness
-
- CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
- Technology feeds
References
-
weblog.rubyonrails.org
/2009/9/4/timing-weakness-in-ruby-on-rails
web, patch
-
github.com
/rails/rails/commit/1f07a89c5946910fc28ea5ccd1da6af8a0f972a0
web
-
github.com
/rails/rails/commit/674f780d59a5a7ec0301755d43a7b277a3ad2978
web
-
github.com
/rails/rails/commit/d460c9a25560f43e7c3789abadf7b455053eb686
web
-
debian.org
/security/2011/dsa-2260
vendor-advisory, web
-
lists.opensuse.org
/opensuse-security-announce/2009-10/msg00004.html
vendor-advisory, web
-
vupen.com
/english/advisories/2009/2544
vdb-entry, vendor-advisory
-
secunia.com
/advisories/36600
third-party-advisory
-
securityfocus.com
/bid/37427
vdb-entry
-
nvd.nist.gov
/vuln/detail/CVE-2009-3086
advisory
-
github.com
/rails/rails
package
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/actionpack/CVE-2009-3086.yml
web
-
github.com
/rubysec/ruby-advisory-db/blob/master/gems/activesupport/CVE-2009-3086.yml
web
-
web.archive.org
/web/20090906010200/http://www.vupen.com/english/advisories/2009/2544
web
-
web.archive.org
/web/20090907001716/http://secunia.com/advisories/36600
web
-
web.archive.org
/web/20200229150042/http://www.securityfocus.com/bid/37427
web
Sources
- CVE List CVE-2009-3086
- GitHub Advisory GHSA-fg9w-g6m4-557j
- NVD CVE-2009-3086
Fencer Vulns 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.