PuTTY before 0.73 mishandles the "bracketed paste mode" protection mechanism, which may allow a session to be affected by malicious clipboard content.
https://security.netapp.com/advisory/ntap-20191127-0003/
https://lists.tartarus.org/pipermail/putty-announce/2019/000029.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00030.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00021.html
http://lists.opensuse.org/opensuse-security-announce/2019-10/msg00020.html