How severe is CVE-2009-3086?

CVE-2009-3086 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2009-3086 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2009-3086?

CVE-2009-3086 primarily affects Rubyonrails Rails. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2009-3086?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2009-3086 published?

CVE-2009-3086 was published on 2009-09-08 and last updated on 2026-06-16.

CVE-2009-3086

CVE-2009-3086 is a medium-severity vulnerability in Rubyonrails Rails with a CVSS 2.0 base score of 5.0. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-200.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 2% (81st percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-200
Affected product: Rubyonrails Rails
Published: 2009-09-08
Last modified: 2026-06-16

Description

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.

Frequently asked questions

What is CVE-2009-3086?: 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.
How severe is CVE-2009-3086?: CVE-2009-3086 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2009-3086 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 2% (81st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2009-3086?: CVE-2009-3086 primarily affects Rubyonrails Rails. In total, 8 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2009-3086?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2009-3086 published?: CVE-2009-3086 was published on 2009-09-08 and last updated on 2026-06-16.

References

Affected products (8)

cpe:2.3:a:rubyonrails:rails:2.1.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.1.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.1.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.0:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.1:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.2.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.3.2:*:*:*:*:*:*:*
cpe:2.3:a:rubyonrails:rails:2.3.3:*:*:*:*:*:*:*

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