CVE-2013-0156: Debian Linux

High severity, CVSS 7.5. EPSS: 99.4% chance of exploitation in the next 30 days.

active_support/core_ext/hash/conversions.rb in Ruby on Rails before 2.3.15, 3.0.x before 3.0.19, 3.1.x before 3.1.10, and 3.2.x before 3.2.11 does not properly restrict casts of string values, which allows remote attackers to conduct object-injection attacks and execute arbitrary code, or cause a denial of service (memory and CPU consumption) involving nested XML entity references, by leveraging Action Pack support for (1) YAML type conversion or (2) Symbol type conversion.

Affected products

• Debian Debian Linux: version 6.0 only; version 7.0 only
• Rubyonrails Rails: from 3.2.0, before 3.2.11 (fixed in 3.2.11)
• Rubyonrails Ruby On Rails: before 2.3.15 (fixed in 2.3.15); from 3.0.0, before 3.0.19 (fixed in 3.0.19); from 3.1.0, before 3.1.10 (fixed in 3.1.10)

Published 2013-01-13. Last modified 2026-06-16.