CVE-2012-5371
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without...
5.0 MediumFix available
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly 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, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.
Exploit likelihood
3.33%Up 1.8 points since Feb 4, 2022
What each source reports
NVD Score used
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly 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, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.
- Record
CVE-2012-5371- CVSS 2.0
- 5.0 Medium
AV:N/AC:L/Au:N/C:N/I:N/A:P - Weakness
- CWE-310
- Updated
- 2026-11-02
CVE List No score
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly 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, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.
- Record
CVE-2012-5371- Updated
- 2026-11-02
EUVDEUVD-2012-5290 No score
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly 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, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.
- Record
EUVD-2012-5290- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-phrv-cj28-9h57 No score
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without...
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly 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, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.
- Record
GHSA-phrv-cj28-9h57- Updated
- 2026-11-02
OSVRHSA-2026:7305
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:7305- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVRHSA-2026:7307
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:7307- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
OSVRHSA-2026:8838
Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update
- Record
RHSA-2026:8838- CVSS 3.1
- 7.5 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - Updated
- 2026-11-02
Affected products
Affected packages
| Package | Affected | Fixed |
|---|---|---|
ruby1.9.1Debian:6.0 |
before 1.9.2.0-2+deb6u5, plus listed versions 1.9.2.0-21.9.2.0-2+armhf |
1.9.2.0-2+deb6u5 |
graphvizRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
graphviz-debuginfoRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
graphviz-develRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
graphviz-docRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
graphviz-gdRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
graphviz-rubyRed Hat:openshift:1::el6 |
before 0:2.26.0-10.el6 | 0:2.26.0-10.el6 |
openshift-consoleRed Hat:openshift:1::el6 |
before 0:0.0.16-1.el6op | 0:0.0.16-1.el6op |
openshift-origin-brokerRed Hat:openshift:1::el6 |
before 0:1.0.11-1.el6op | 0:1.0.11-1.el6op |
openshift-origin-broker-utilRed Hat:openshift:1::el6 |
before 0:1.0.15-1.el6op | 0:1.0.15-1.el6op |
Show 78 moreShow less
| Package | Affected | Fixed |
|---|---|---|
ruby193-rubyRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-debuginfoRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-develRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-docRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-irbRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-libsRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-ruby-tcltkRed Hat:openshift:1::el6 |
before 0:1.9.3.327-25.el6 | 0:1.9.3.327-25.el6 |
ruby193-rubygem-actionpackRed Hat:openshift:1::el6 |
before 1:3.2.8-3.el6 | 1:3.2.8-3.el6 |
ruby193-rubygem-actionpack-docRed Hat:openshift:1::el6 |
before 1:3.2.8-3.el6 | 1:3.2.8-3.el6 |
ruby193-rubygem-activemodelRed Hat:openshift:1::el6 |
before 0:3.2.8-2.el6 | 0:3.2.8-2.el6 |
ruby193-rubygem-activemodel-docRed Hat:openshift:1::el6 |
before 0:3.2.8-2.el6 | 0:3.2.8-2.el6 |
ruby193-rubygem-activerecordRed Hat:openshift:1::el6 |
before 1:3.2.8-3.el6 | 1:3.2.8-3.el6 |
ruby193-rubygem-activerecord-docRed Hat:openshift:1::el6 |
before 1:3.2.8-3.el6 | 1:3.2.8-3.el6 |
ruby193-rubygem-bigdecimalRed Hat:openshift:1::el6 |
before 0:1.1.0-25.el6 | 0:1.1.0-25.el6 |
ruby193-rubygem-io-consoleRed Hat:openshift:1::el6 |
before 0:0.3-25.el6 | 0:0.3-25.el6 |
ruby193-rubygem-jsonRed Hat:openshift:1::el6 |
before 0:1.5.4-25.el6 | 0:1.5.4-25.el6 |
ruby193-rubygem-minitestRed Hat:openshift:1::el6 |
before 0:2.5.1-25.el6 | 0:2.5.1-25.el6 |
ruby193-rubygem-railtiesRed Hat:openshift:1::el6 |
before 0:3.2.8-2.el6 | 0:3.2.8-2.el6 |
ruby193-rubygem-railties-docRed Hat:openshift:1::el6 |
before 0:3.2.8-2.el6 | 0:3.2.8-2.el6 |
ruby193-rubygem-rakeRed Hat:openshift:1::el6 |
before 0:0.9.2.2-25.el6 | 0:0.9.2.2-25.el6 |
ruby193-rubygem-rdocRed Hat:openshift:1::el6 |
before 0:3.9.4-25.el6 | 0:3.9.4-25.el6 |
ruby193-rubygem-ruby_parserRed Hat:openshift:1::el6 |
before 0:2.3.1-3.el6op | 0:2.3.1-3.el6op |
ruby193-rubygem-ruby_parser-docRed Hat:openshift:1::el6 |
before 0:2.3.1-3.el6op | 0:2.3.1-3.el6op |
ruby193-rubygemsRed Hat:openshift:1::el6 |
before 0:1.8.23-25.el6 | 0:1.8.23-25.el6 |
ruby193-rubygems-develRed Hat:openshift:1::el6 |
before 0:1.8.23-25.el6 | 0:1.8.23-25.el6 |
rubygem-actionpackRed Hat:openshift:1::el6 |
before 1:3.0.13-4.el6op | 1:3.0.13-4.el6op |
rubygem-activemodelRed Hat:openshift:1::el6 |
before 0:3.0.13-3.el6op | 0:3.0.13-3.el6op |
rubygem-activemodel-docRed Hat:openshift:1::el6 |
before 0:3.0.13-3.el6op | 0:3.0.13-3.el6op |
rubygem-activerecordRed Hat:openshift:1::el6 |
before 1:3.0.13-5.el6op | 1:3.0.13-5.el6op |
rubygem-bsonRed Hat:openshift:1::el6 |
before 0:1.8.1-2.el6op | 0:1.8.1-2.el6op |
rubygem-mongoRed Hat:openshift:1::el6 |
before 0:1.8.1-2.el6op | 0:1.8.1-2.el6op |
rubygem-mongo-docRed Hat:openshift:1::el6 |
before 0:1.8.1-2.el6op | 0:1.8.1-2.el6op |
rubygem-openshift-origin-auth-remote-userRed Hat:openshift:1::el6 |
before 0:1.0.5-1.el6op | 0:1.0.5-1.el6op |
rubygem-openshift-origin-consoleRed Hat:openshift:1::el6 |
before 0:1.0.10-1.el6op | 0:1.0.10-1.el6op |
rubygem-openshift-origin-console-docRed Hat:openshift:1::el6 |
before 0:1.0.10-1.el6op | 0:1.0.10-1.el6op |
rubygem-openshift-origin-controllerRed Hat:openshift:1::el6 |
before 0:1.0.12-1.el6op | 0:1.0.12-1.el6op |
rubygem-ruby_parserRed Hat:openshift:1::el6 |
before 0:2.0.4-6.el6op | 0:2.0.4-6.el6op |
rubygem-ruby_parser-docRed Hat:openshift:1::el6 |
before 0:2.0.4-6.el6op | 0:2.0.4-6.el6op |
openshift-origin-cartridge-jbosseap-6.0Red Hat:openshift:1::el6 |
before 0:1.0.4-1.el6op | 0:1.0.4-1.el6op |
openshift-origin-cartridge-cron-1.4Red Hat:openshift:1::el6 |
before 0:1.0.3-1.el6op | 0:1.0.3-1.el6op |
openshift-origin-cartridge-diy-0.1Red Hat:openshift:1::el6 |
before 0:1.0.3-1.el6op | 0:1.0.3-1.el6op |
openshift-origin-cartridge-haproxy-1.4Red Hat:openshift:1::el6 |
before 0:1.0.4-1.el6op | 0:1.0.4-1.el6op |
openshift-origin-cartridge-jbossews-1.0Red Hat:openshift:1::el6 |
before 0:1.0.13-1.el6op | 0:1.0.13-1.el6op |
openshift-origin-cartridge-jenkins-1.4Red Hat:openshift:1::el6 |
before 0:1.0.2-1.el6op | 0:1.0.2-1.el6op |
openshift-origin-cartridge-jenkins-client-1.4Red Hat:openshift:1::el6 |
before 0:1.0.2-1.el6op | 0:1.0.2-1.el6op |
openshift-origin-cartridge-mysql-5.1Red Hat:openshift:1::el6 |
before 0:1.0.5-1.el6op | 0:1.0.5-1.el6op |
openshift-origin-cartridge-perl-5.10Red Hat:openshift:1::el6 |
before 0:1.0.3-1.el6op | 0:1.0.3-1.el6op |
openshift-origin-cartridge-php-5.3Red Hat:openshift:1::el6 |
before 0:1.0.5-1.el6op | 0:1.0.5-1.el6op |
openshift-origin-cartridge-postgresql-8.4Red Hat:openshift:1::el6 |
before 0:1.0.3-2.el6op | 0:1.0.3-2.el6op |
openshift-origin-cartridge-ruby-1.8Red Hat:openshift:1::el6 |
before 0:1.0.7-1.el6op | 0:1.0.7-1.el6op |
openshift-origin-cartridge-ruby-1.9-sclRed Hat:openshift:1::el6 |
before 0:1.0.8-1.el6op | 0:1.0.8-1.el6op |
openshift-origin-msg-node-mcollectiveRed Hat:openshift:1::el6 |
before 0:1.0.3-1.el6op | 0:1.0.3-1.el6op |
phpRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-bcmathRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-debuginfoRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-develRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-imapRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-mbstringRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
php-processRed Hat:openshift:1::el6 |
before 0:5.3.3-22.el6 | 0:5.3.3-22.el6 |
rubygem-openshift-origin-nodeRed Hat:openshift:1::el6 |
before 0:1.0.11-1.el6op | 0:1.0.11-1.el6op |
ruby3.3Red Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.3-bundled-gemsRed Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.3-default-gemsRed Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.3-develRed Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.3-docRed Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.3-libsRed Hat:hummingbird:1 |
before 0:3.3.10-23.1.hum1 | 0:3.3.10-23.1.hum1 |
ruby3.4Red Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby3.4-bundled-gemsRed Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby3.4-default-gemsRed Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby3.4-develRed Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby3.4-docRed Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby3.4-libsRed Hat:hummingbird:1 |
before 0:3.4.8-31.1.hum1 | 0:3.4.8-31.1.hum1 |
ruby4.0Red Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
ruby4.0-bundled-gemsRed Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
ruby4.0-default-gemsRed Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
ruby4.0-develRed Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
ruby4.0-docRed Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
ruby4.0-libsRed Hat:hummingbird:1 |
before 0:4.0.0-33.3.hum1 | 0:4.0.0-33.3.hum1 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD, OSV |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2012-5371 is a medium vulnerability (CVSS 5.0) in Ruby-lang Ruby, published November 28, 2012. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 3.33%, the 88th percentile. Fixed in ruby1.9.1 1.9.2.0-2+deb6u5.
References
asfws12.files.wordpress.com/2012/11/asfws2012-jean_philippe_aumasson-martin_bosslet-hash_flooding_dos_reloaded.pdf
securitytracker.com/id?1027747
osvdb.org/87280
securityfocus.com/bid/56484
131002.net/data/talks/appsec12_slides.pdf
ruby-lang.org/en/news/2012/11/09/ruby19-hashdos-cve-2012-5371
Show 194 moreShow less
2012.appsec-forum.ch/conferences
bugzilla.redhat.com/show_bug.cgi?id=875236
secunia.com/advisories/51253
ocert.org/advisories/ocert-2012-001.html
ubuntu.com/usn/USN-1733-1
exchange.xforce.ibmcloud.com/vulnerabilities/79993
nvd.nist.gov/vuln/detail/CVE-2012-5371
github.com/advisories/GHSA-phrv-cj28-9h57
access.redhat.com/errata/RHSA-2013:0582
security.access.redhat.com/data/csaf/v2/advisories/2013/rhsa-2013_0582.json
cve.org/CVERecord?id=CVE-2012-2660
images.redhat.com
hackerone.com/reports/3467067
This page doesn't list everything
Left out here: 46 references. The JSON record has them.