/etc/sudoers.d/10-ubuntu-core-secure-path is in ubuntu-core-config 0.6.40.
This file is owned by root:root, with mode 0o440.
The actual contents of the file can be viewed below.
1 | Defaults secure_path="/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin:/snap/bin"
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