Changelog #8
If you use the Chaos tool suite module for Drupal 8.x, upgrade to Chaos tool suite 8.x-3.6
Chaos tool suite (ctools) module provides a number of APIs and extensions for Drupal, it's 8.x-3.x branch is a start from scratch to evaluate the features of ctools that didn't make it into Drupal Core 8.0.x and port them.
Security Release information: https://www.drupal.org/sa-contrib-2021-009
Ctools Page: https://www.drupal.org/project/ctools