Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 6.0 | ruby1.9.1 | 1.9.2.0-2+deb6u5 | DLA-263-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Red Hat OpenShift 1 | graphviz +4 | 2.26.0-10.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-console | 0.0.16-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-broker +1 | 1.0.11-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-broker-util | 1.0.15-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-diy-0.1 +3 | 1.0.3-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-haproxy-1.4 +1 | 1.0.4-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-jbossews-1.0 | 1.0.13-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-jenkins-1.4 +1 | 1.0.2-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-php-5.3 +2 | 1.0.5-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-postgresql-8.4 | 1.0.3-2.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-ruby-1.8 | 1.0.7-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | openshift-origin-cartridge-ruby-1.9-scl | 1.0.8-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | php +5 | 5.3.3-22.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-ruby +5 | 1.9.3.327-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-actionpack +3 | 1:3.2.8-3.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-bigdecimal | 1.1.0-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-io-console | 0.3-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-json | 1.5.4-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-minitest | 2.5.1-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-railties +3 | 3.2.8-2.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-rake | 0.9.2.2-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-rdoc | 3.9.4-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygem-ruby_parser +1 | 2.3.1-3.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | ruby193-rubygems +1 | 1.8.23-25.el6 | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-actionpack | 1:3.0.13-4.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-activemodel +1 | 3.0.13-3.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-activerecord | 1:3.0.13-5.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-bson +2 | 1.8.1-2.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-openshift-origin-console +1 | 1.0.10-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-openshift-origin-controller | 1.0.12-1.el6op | RHSA-2013:0582 |
| Red Hat OpenShift 1 | rubygem-ruby_parser +1 | 2.0.4-6.el6op | RHSA-2013:0582 |
| Red Hat Hardened Images 1 | ruby3.3 +5 | 3.3.10-23.1.hum1 | RHSA-2026:7305 |
| Red Hat Hardened Images 1 | ruby3.4 +5 | 3.4.8-31.1.hum1 | RHSA-2026:7307 |
| Red Hat Hardened Images 1 | ruby4.0 +5 | 4.0.0-33.3.hum1 | RHSA-2026:8838 |
Advisories 5
- RHSA-2026:7305 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:8838 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2026:7307 Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update Red Hat Security Advisories (RHSA) · Oct 6, 2026
- RHSA-2013:0582 Red Hat Security Advisory: Red Hat OpenShift Enterprise 1.1.1 update Red Hat Security Advisories (RHSA) · Jun 28, 2026
- DLA-263-1 ruby1.9.1 - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- http://asfws12.files.wordpress.com/2012/11/asfws2012-jean_philippe_aumasson-martin_bosslet-hash_flooding_dos_reloaded.pdf
- 1027747 vdb-entry
- 87280 vdb-entry
- 56484 vdb-entry
- https://www.131002.net/data/talks/appsec12_slides.pdf
- http://www.ruby-lang.org/en/news/2012/11/09/ruby19-hashdos-cve-2012-5371/
- http://2012.appsec-forum.ch/conferences/#c17
- https://bugzilla.redhat.com/show_bug.cgi?id=875236
- 51253 third-party-advisory
- http://www.ocert.org/advisories/ocert-2012-001.html
- USN-1733-1 vendor-advisory
- ruby-hash-function-dos(79993) vdb-entry