How severe is CVE-2011-2686?

CVE-2011-2686 has a CVSS 2.0 base score of 5.0, rated medium severity.

Is CVE-2011-2686 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2011-2686?

CVE-2011-2686 primarily affects Ruby-lang Ruby. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2011-2686?

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

When was CVE-2011-2686 published?

CVE-2011-2686 was published on 2011-08-05 and last updated on 2026-06-16.

CVE-2011-2686

CVE-2011-2686 is a medium-severity vulnerability in Ruby-lang Ruby 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-310.

Key facts

Severity: Medium (CVSS 2.0 base score 5.0)
EPSS exploit prediction: 3% (83rd percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-310
Affected product: Ruby-lang Ruby
Published: 2011-08-05
Last modified: 2026-06-16

Description

Ruby before 1.8.7-p352 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the values of random numbers by leveraging knowledge of the number sequence obtained in a different child process, a related issue to CVE-2003-0900. NOTE: this issue exists because of a regression during Ruby 1.8.6 development.

Frequently asked questions

What is CVE-2011-2686?: Ruby before 1.8.7-p352 does not reset the random seed upon forking, which makes it easier for context-dependent attackers to predict the values of random numbers by leveraging knowledge of the number sequence obtained in a different child process, a related issue to CVE-2003-0900. NOTE: this issue exists because of a regression during Ruby 1.8.6 development.
How severe is CVE-2011-2686?: CVE-2011-2686 has a CVSS 2.0 base score of 5.0, rated medium severity.
Is CVE-2011-2686 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 3% (83rd percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2011-2686?: CVE-2011-2686 primarily affects Ruby-lang Ruby. In total, 12 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2011-2686?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2011-2686 published?: CVE-2011-2686 was published on 2011-08-05 and last updated on 2026-06-16.

References

Affected products (12)

cpe:2.3:a:ruby-lang:ruby:*:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7:p22:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7:p71:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7:p72:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-160:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-173:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-248:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-249:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-299:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-302:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-330:*:*:*:*:*:*:*
cpe:2.3:a:ruby-lang:ruby:1.8.7-p21:*:*:*:*:*:*:*

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