emitters.py in Django Piston before 0.2.3 and 0.2.x before 0.2.2.1 does not properly deserialize YAML data, which allows remote attackers to execute arbitrary Python code via vectors related to the yaml.load method.
Debian Linux Security Advisory 2344-1 - It was discovered that the Piston framework can deserializes untrusted YAML and Pickle data, leading to remote code execution.