In utils
In utils.c in zsh before 5.4, symlink expansion had a buffer overflow.
Exploitability
AV:N
AC:L
PR:N
UI:N
Scope
S:U
Impact
C:H
I:H
A:H
9.8/CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H