Denial-Of-Service (DoS)

ESPHome is vulnerable to a Denial-Of-Service DoS. The vulnerability is due to an integer overflow in the API protobuf decoder, where an attacker-controlled fieldlength value can overflow the bounds check in proto.cpp, bypassing validation and causing invalid memory access that crashes the device,...

EUVD-2026-3306

ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component...

CVE-2026-23833 ESPHome vulnerable to denial-of-service via out-of-bounds check bypass in the API component

ESPHome is a system to control microcontrollers remotely through Home Automation systems. In versions 2025.9.0 through 2025.12.6, an integer overflow in the API component's protobuf decoder allows denial-of-service attacks when API encryption is not used. The bounds check ptr + fieldlength end in...