Heap Buffer Overflow in append_command in vim/vim prior to 8.2.4895. https://github.com/vim/vim/commit/d88934406c5375d88f8f1b65331c9f0cab68cc6c https://huntr.dev/bounties/40f1d75f-fb2f-4281-b585-a41017f217e2
Created vim tracking bugs for this issue: Affects: fedora-all [bug 2083472]
Victim has to run an untrusted file IN SCRIPT MODE. Changing severity to Low.