CVE-2026-91018: Lwip API

High severity, CVSS 8.8. EPSS: 0.2% chance of exploitation in the next 30 days.

lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.

Affected products

• Lwip Lwip API: from 2.0.1, up to and including 2.2.1

Published 2026-09-22. Last modified 2026-09-23.