A flaw was discovered in the way Ansible templating was implemented in versions before 2.6.18, 2.7.12 and 2.8.2, causing the possibility of information disclosure through unexpected variable substitution. By taking advantage of unintended variable substitution the content of any variable may be disclosed.
access.redhat.com/errata/RHSA-2019:3744
access.redhat.com/errata/RHSA-2019:3789
bugzilla.redhat.com/show_bug.cgi?id=CVE-2019-10156
github.com/advisories/GHSA-grgm-pph5-j5h7
github.com/ansible/ansible/pull/57188
lists.debian.org/debian-lts-announce/2019/09/msg00016.html
lists.debian.org/debian-lts-announce/2021/01/msg00023.html