Net::CIDR::Lite versions before 0.24 for Perl does not properly validate IP address and CIDR mask inputs, which may allow IP ACL bypass.

Inputs containing a trailing newline or non-ASCII digit characters pass the validators but are then re-encoded by the parser to a different address than the input string spelled. find() and bin_find() can match or miss addresses as a result.

Example:

my $cidr = Net::CIDR::Lite->new();
$cidr->add("::1\n/128");
$cidr->find("::1a"); # incorrectly returns true

See also CVE-2026-45191.

References

• https://nvd.nist.gov/vuln/detail/CVE-2026-45190
• https://github.com/stigtsp/Net-CIDR-Lite/commit/ca9542adec87110556601d7ce48381ea8d13e692.patch
• https://metacpan.org/release/STIGTSP/Net-CIDR-Lite-0.24/changes
• https://www.cve.org/CVERecord?id=CVE-2026-45191