CVE-2026-54410: Debevv Nanomodbus

High severity, CVSS 8.6. EPSS: 0.9% chance of exploitation in the next 30 days.

nanoMODBUS through v1.23.0 contains an off-by-one buffer overflow in the recv_msg_header function of the Modbus/TCP server that allows remote unauthenticated attackers to write one attacker-controlled byte past the end of the 260-byte receive buffer by sending a crafted MBAP frame whose Length field is set to 255.

Affected products

• Debevv Nanomodbus: up to and including 1.23.0

Published 2026-06-14. Last modified 2026-08-10.