CVE-2011-4815
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (4.06%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
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.
- CVSS 2.0
- 7.8 HIGHAV:N/AC:L/Au:N/C:N/I:N/A:C
- EPSS
- 4.06% probability · 91th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- ruby-lang/ruby
- Source
- cve@mitre.org
EPSS 4.1% since 26 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
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/903934US Government Resource
- http://www.nruns.com/_downloads/advisory28122011.pdf
- http://www.ocert.org/advisories/ocert-2011-003.html
- http://www.ruby-lang.org/en/news/2011/12/28/denial-of-service-attack-was-found-for-rubys-hash-algorithm/
- http://www.securitytracker.com/id?1026474
- https://exchange.xforce.ibmcloud.com/vulnerabilities/72020
- 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/903934US Government Resource
- http://www.nruns.com/_downloads/advisory28122011.pdf
- http://www.ocert.org/advisories/ocert-2011-003.html
- http://www.ruby-lang.org/en/news/2011/12/28/denial-of-service-attack-was-found-for-rubys-hash-algorithm/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.