CVE-2026-54410 – nanoMODBUS TCP Server Off-by-One Buffer Overflow

CVE ID :CVE-2026-54410

Published : June 14, 2026, 5:10 p.m. | 47 minutes ago

Description :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. The overflow corrupts the adjacent buffer-index field of the nanoMODBUS state structure, resulting in denial of service through invalid memory accesses and, on bare-metal and RTOS targets without memory protection, one-byte information disclosure and writes to unintended register addresses on the Write Multiple Registers (FC16) handler path.

Severity: 9.0 | HIGH

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