It was found that Mako, a Python template library, was vulnerable to a denial of service attack via crafted regular expressions.
For Debian 10 buster, this problem has been fixed in version 1.0.7+ds1-1+deb10u1.
We recommend that you upgrade your mako packages.
For the detailed security status of mako please refer to its security tracker page at: https://security-tracker.debian.org/tracker/mako
Further information about Debian LTS security advisories, how to apply these updates to your system and frequently asked questions can be found at: https://wiki.debian.org/LTS