Artifex Ghostscript through 9.26 mishandles .completefont. NOTE: this issue exists because of an incomplete fix for CVE-2019-3839.
https://lists.debian.org/debian-lts-announce/2022/05/msg00000.html
http://git.ghostscript.com/?p=ghostpdl.git%3Ba=commit%3Bh=430e219ea17a2650577d70021399c4ead05869e0