Vim 8.0 allows attackers to cause a denial of service (invalid free) or possibly have unspecified other impact via a crafted source (aka -S) file. NOTE: there might be a limited number of scenarios in which this has security relevance.
https://usn.ubuntu.com/4309-1/
https://lists.debian.org/debian-lts-announce/2019/08/msg00003.html