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Test your applicationsUpgrade RHEL:7 ansible to version 0:2.7.14-1.el7ae or higher.
This issue was patched in RHSA-2019:3202.
Note: Versions mentioned in the description apply only to the upstream ansible package and not the ansible package as distributed by RHEL.
See How to fix? for RHEL:7 relevant fixed versions and status.
ansible before versions 2.8.6, 2.7.14, 2.6.20 is vulnerable to a None