Augeas versions up to and including 1.8.0 are vulnerable to heap-based buffer overflow due to improper handling of escaped strings. Attacker could send crafted strings that would cause the application using augeas to copy past the end of a buffer, leading to a crash or possible code execution.
https://puppet.com/security/cve/cve-2017-7555
https://github.com/hercules-team/augeas/pull/480
https://access.redhat.com/errata/RHSA-2019:2403
https://access.redhat.com/errata/RHSA-2017:2788