The nori gem 2.0.x before 2.0.2 1.1.x before 1.1.4 and 1.0.x before 1.0.3 for Ruby 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 a similar vulnerability to CVE-2013-0156.