There is a new pull request by ndowens against master on the void-packages repository

https://github.com/ndowens/void-packages imagemagick6
https://github.com/void-linux/void-packages/pull/15886

ImageMagick6: update to 6.9.10-69
Includes fixes for CVE-2019-17540
URL:https://security-tracker.debian.org/tracker/CVE-2019-17540

A patch file from https://github.com/void-linux/void-packages/pull/15886.patch is attached