CVE-2011-4815

Severity: high (CVSS 7.8 v2.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 4.1% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2011-12-30 · updated 2026-06-16
Weakness: CWE-20

Description

Ruby (aka CRuby) before 1.8.7-p357 computes hash values without restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table.

Affected products

Ruby: through 1.8.7-p352; 1.8.7-p299, 1.8.7-p302, 1.8.7-p330, 1.8.7-p334

References

http://archives.neohapsis.com/archives/bugtraq/2011-12/0181.html
http://blade.nagaokaut.ac.jp/cgi-bin/scat.rb/ruby/ruby-talk/391606
http://jvn.jp/en/jp/JVN90615481/index.html
http://jvndb.jvn.jp/ja/contents/2012/JVNDB-2012-000066.html
http://lists.apple.com/archives/security-announce/2012/May/msg00001.html
http://rhn.redhat.com/errata/RHSA-2012-0069.html
http://rhn.redhat.com/errata/RHSA-2012-0070.html
http://secunia.com/advisories/47405
http://secunia.com/advisories/47822
http://support.apple.com/kb/HT5281
http://www.kb.cert.org/vuls/id/903934
http://www.nruns.com/_downloads/advisory28122011.pdf

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