CVE-2026-86287

High severity, CVSS 7.5. EPSS: 0.6% chance of exploitation in the next 30 days.

Net::IP::LPM versions before 1.12 for Perl accept malformed prefix lengths. Non-numeric and non-ASCII prefix lengths are accepted and treated as 0. Integers over 31 bits are silently truncated. A single malformed mask will poison the lookup table. The result is that the lookup will silently succeed for every address. An allow-list will allow every address, and a deny-list will block every address.

Published 2026-09-07. Last modified 2026-09-08.