In PuTTY versions before 0.71 on Windows, local attackers could hijack the application by putting a malicious help file in the same directory as the executable.
https://www.chiark.greenend.org.uk/~sgtatham/putty/changes.html
https://security.netapp.com/advisory/ntap-20190404-0001/
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00020.html
http://lists.opensuse.org/opensuse-security-announce/2019-04/msg00004.html