Updated python-yaml packages fix security vulnerability:
Jonathan Gray and Stanislaw Pitucha found an assertion failure in the way wrapped strings are parsed in Python-YAML, a YAML parser and emitter for Python. An attacker able to load specially crafted YAML input into an application using python-yaml could cause the application to crash.
This issue is similar to CVE-2014-9130, but the assertion was independently implemented in Python-YAML.