Although many, I would say the majority, of readers of Ubunlog They will use Ubuntu, one of its official flavors or a distribution based on the Canonical system, we all know that it is based on Debian. Ubuntu has many good things, among which we have that it is more intuitive and that it adds many new features every six months, but this can also cause some problems to appear, such as the bug that prevents dragging things from/to the desktop. This is somewhat more difficult in a Debian that introduces the news more calmly.
Debian is a very robust system, partly because its philosophy is to add only the necessary new features and once it is clear that they work perfectly. What they do work faster at is fixing bugs, and that is what they have done mainly when releasing Debian 10.1 Buster and Debian 9.10 Stretch. Both versions they have focused on polishing what they launched in June 2017 and in julio de 2019, among which we have several security fixes.
New versions of Debian to fix bugs and patch vulnerabilities
As these are maintenance releases that have focused on correcting bugs, the lists of news are very extensive to add in a post like this, but in both cases they tell us that:
This point release mainly adds fixes for security bugs along with a few fixes for serious problems […] Note that the point release does not constitute a new version of Debian 10/9, but only updates to the bundled packages. No need to throw away old Buster / Stretch media files. After installation, packages can be updated to current versions using an updated Debian mirror.
You have the lists of everything that has been corrected in these versions in these links: the one from 10.1 y the one from 9.10.