**TLDR: Some Perl modules for working with IP addresses and netmasks have bugs with potential security applications.**
If you are using Net-Netmask, you should upgrade to the latest version. For more details, including on other affected and unaffected distros, please see the post on [Dave Rolsky's personal blog](https://blog.urth.org/2021/03/29/security-issues-in-perl-ip-address-distros/).
