A flaw was found in ansible. ansible.cfg is read from the current working directory which can be altered to make it point to a plugin or a module path under the control of an attacker, thus allowing the attacker to execute arbitrary code.
https://www.debian.org/security/2019/dsa-4396
https://usn.ubuntu.com/4072-1/
https://lists.debian.org/debian-lts-announce/2019/09/msg00016.html
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2018-10875
https://access.redhat.com/errata/RHSA-2019:0054
https://access.redhat.com/errata/RHSA-2018:2585
https://access.redhat.com/errata/RHSA-2018:2321
https://access.redhat.com/errata/RHSA-2018:2166
https://access.redhat.com/errata/RHSA-2018:2152
https://access.redhat.com/errata/RHSA-2018:2151
https://access.redhat.com/errata/RHSA-2018:2150
https://access.redhat.com/errata/RHBA-2018:3788
http://www.securitytracker.com/id/1041396
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00021.html