A heap-based OOB read of size 1 occurs when a user tries to open a vim session file specified below. This happens regardless of any command line options that could be specified to restrict vim, such -Z and -m.
Created vim tracking bugs for this issue:
Affects: fedora-all [bug 2044956]
Marked services affected/delegated. Affected code is present, however impact is moderate and actual occurrence of flaw is unlikely.