CVE-2013-4363: Ruby-Lang Ruby

Medium severity, CVSS 4.3. EPSS: 1.7% chance of exploitation in the next 30 days.

Algorithmic complexity vulnerability in Gem::Version::ANCHORED_VERSION_PATTERN in lib/rubygems/version.rb in RubyGems before 1.8.23.2, 1.8.24 through 1.8.26, 2.0.x before 2.0.10, and 2.1.x before 2.1.5, as used in Ruby 1.9.0 through 2.0.0p247, allows remote attackers to cause a denial of service (CPU consumption) via a crafted gem version that triggers a large amount of backtracking in a regular expression. NOTE: this issue is due to an incomplete fix for CVE-2013-4287.

Affected products

• Ruby-Lang Ruby: version 1.9 only; version 1.9.1 only; version 1.9.2 only; version 1.9.3 only; version 2.0 only; version 2.0.0 only
• Rubygems Rubygems: up to and including 1.8.23; version 1.8.0 only; version 1.8.1 only; version 1.8.2 only; version 1.8.3 only; version 1.8.4 only; …

Published 2013-10-17. Last modified 2026-06-16.