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The script /etc/update-motd.d/90-updates-available provides a summary of system updates, for example:

/etc/update-motd.d/90-updates-available  
281 packages can be updated.
209 updates are security updates.

Is there any way to list this 209 security updates?

Apparently, this script comes from /usr/lib/update-notifier/update-motd-updates-available but I can't find any clue about where is it taking the values.

I thought the list could be taken from the command apt list --upgradable, but I don't find a coincidence between the number of packages when doing grep with the word "security":

apt list --upgradable | grep security | wc -l
WARNING: apt does not have a stable CLI interface. Use with caution in scripts.
184
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    This doesn’t answer the question in full, but you can see the packages names by running /usr/lib/update-notifier/apt-check -p (this is the tool which generates the motd snippet). That however doesn’t separate security updates from other updates. – Stephen Kitt Oct 15 '19 at 11:47

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