K000152943: PyYAML vulnerability CVE-2019-20477

Security Advisory Description PyYAML 5.1 through 5.1.2 has insufficient restrictions on the load and loadall functions because of a class deserialization issue, e.g., Popen is a class in the subprocess module. NOTE: this issue exists because of an incomplete fix for CVE-2017-18342. CVE-2019-20477...