node-nth-check, is a NodeJS module module used to parse and compile nth-checks, as they are found in CSS 3's nth-child() and nth-last-of-type() functions.
This module was vulnerable to a regular expression denial of service used for parsing.
For Debian 10 buster, this problem has been fixed in version 1.0.1-1+deb10u1.
We recommend that you upgrade your node-nth-check packages.
For the detailed security status of node-nth-check please refer to its security tracker page at: https://security-tracker.debian.org/tracker/node-nth-check
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