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Servers and applications

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.

Severity
Medium 5.0
Published
5 Aug 2011
Last changed
16 Jun 2026
Added to UpHeron
21 Oct 2026
Exploit chance
2.6% in the next 30 daysHigher than 85% of CVEs. EPSS by FIRST, 12 Nov 2026
Weakness
CWE-310
Attack
Over the network · No login needed
Attacker can
Read some data
CVSS vector
AV:N/AC:L/Au:N/C:P/I:N/A:N
Sources
NVD

Affected software

SoftwareAffected versions
RubyServers and applications · cpe:a:ruby-lang:ruby
  • Version 1.8.7-p72
  • Version 1.8.7-p71
  • Version 1.8.7-p22
  • Version 1.8.7-p21
All 12 release lines
  • Every version up to 1.8.7-334
  • Version 1.8.7-160
  • Version 1.8.7-173
  • Version 1.8.7-248
  • Version 1.8.7-249
  • Version 1.8.7-299
  • Version 1.8.7-302
  • Version 1.8.7-330
  • Version 1.8.7-p21
  • Version 1.8.7-p22
  • Version 1.8.7-p71
  • Version 1.8.7-p72

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2011-2686
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2011-2686