Buffer overflow in TP-Link Systems Inc. Deco M9 Plus V2

CVE-2026-8618

A stack-based buffer overflow vulnerability exists in the TDDPv2 service (/usr/bin/tddp) on Deco M9 Plus due to insufficient validation of decrypted request data length before it is copied into a fixed-size stack buffer in the subtype 0x91 handler. Successful exploitation may allow an adjacent, unauthenticated attacker to cause a denial of service or achieve arbitrary code execution during the device setup phase through crafted TDDP packets.

Vulnerability class: Buffer Overflow

Published 2026-10-01 · last modified 2026-10-01.