Net::CIDR versions before 0.24 for Perl mishandle leading zeros in IP CIDR addresses, which may have unspecified impact. The functions addr2cidr and cidrlookup may return leading zeros in a CIDR string, which may in turn be parsed as octal numbers by subsequent users. Current versions of the module strip leading zeros from octets.

Source: Fedora 42 perl-Net-CIDR Critical Leading Zeros Issue 2026-baf8782c7a