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Fencer Intel
medium 4.3

CVE-2012-6109 json

Rack vulnerable to REDoS

published 2013-03-01 13 y ago modified 2026-06-16 4 mo ago also GHSA-h77x-m5q8-c29h , EUVD-2017-0248

cvss
4.3
version 2.0, NVD
cisa kev
Not listed
not in CISA's catalog
epss
2.7%
EPSS 2.7% chance of exploitation in 30 days, percentile 86%
public exploits
0
none known

Summary

lib/rack/multipart.rb in Rack before 1.1.4, 1.2.x before 1.2.6, 1.3.x before 1.3.7, and 1.4.x before 1.4.2 uses an incorrect regular expression, which allows remote attackers to cause a denial of service (infinite loop) via a crafted Content-Disposion header.

Patch / fix

  • rubygems rack 1.1.4, 1.2.6, 1.3.7, 1.4.2
  • ruby-rack Debian 14, Debian 13, Debian 12 1.4.1-2.1

debian advisories DEBIAN-CVE-2012-6109

  • ruby-rack Ubuntu 14.04 LTS 1.5.2-1

ubuntu advisories UBUNTU-CVE-2012-6109

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2012-6109 updated cvss 4.3

rubygem-rack: parsing Content-Disposition header DoS

  • Red Hat OpenShift Enterprise 1 rubygem-rack, rubygem193-rack
    affected: no fix planned “Will not fix”
  • Red Hat Enterprise MRG 2 rubygem-rack
    affected: no fix available
  • Red Hat CloudForms Cloud Engine for RHEL 6 Server rubygem-rdoc 3.8-6.el6cf, rubygem-rack 1.3.0-3.el6cf, rubygem-shoulda 2.11.3-5.el6cf, rubygem-delayed_job 2.1.4-3.el6cf, rubygem-rspec-rails 2.6.1-7.el6cf, rubygem-ruby_parser 2.0.4-6.el6cf, +4 more Red Hat CloudForms System Engine for RHEL 6 Server rubygem-rdoc 3.8-6.el6cf, rubygem-rack 1.3.0-3.el6cf, rubygem-delayed_job 2.1.4-3.el6cf, rubygem-ruby_parser 2.0.4-6.el6cf, rubygem-rails_warden 0.5.5-2.el6cf, ruby-nokogiri 1.5.0-0.9.beta4.el6cf, +2 more
    fixed: vendor fix RHSA-2013:0548
  • Red Hat Subscription Asset Manager for RHEL 6 Server quartz 2.1.5-4.el6_3, puppet 2.6.17-2.el6cf, katello 1.2.1-15h.el6_3, lucene3 3.6.1-10h.el6_3, candlepin 0.7.23-1.el6_3, thumbslug 0.0.28-1.el6_3, +27 more
    fixed: vendor fix RHSA-2013:0544

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

Exploit prediction

2.72% chance of exploitation in the next 30 days, higher than 86% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
NVD 2.0 4.3 AV:N/AC:M/Au:N/C:N/I:N/A:P

Affected packages

ecosystem package affected fixed in
rubygems rack
<1.1.4
>=1.2.0, <1.2.6
>=1.3.0, <1.3.7
>=1.4.0, <1.4.2
1.1.4
1.2.6
1.3.7
1.4.2

Classification

Weakness
  • CWE-835 Loop with Unreachable Exit Condition

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.