(since this bug has come up in UbuntCore discussions and apparently scared some people)
note that netplan configs on Ubuntu Core as created by subiquity are root-only readable, so UbuntuCore is not affected:
$ ls -l /etc/netplan/00-snapd-config.yaml -rw------- 1 root root 138 Jul 25 13:19 /etc/netplan/00-snapd-config.yaml
(since this bug has come up in UbuntCore discussions and apparently scared some people)
note that netplan configs on Ubuntu Core as created by subiquity are root-only readable, so UbuntuCore is not affected:
$ ls -l /etc/netplan/ 00-snapd- config. yaml 00-snapd- config. yaml
-rw------- 1 root root 138 Jul 25 13:19 /etc/netplan/