CVE-2026-23833
HighSummary
W systemie ESPHome, w wersjach od 2025.9.0 do 2025.12.6, występuje przepełnienie całkowitej liczby w dekoderze protobuf komponentu API, co umożliwia ataki typu denial-of-service, gdy szyfrowanie API nie jest używane. Atakujący może wysłać złośliwą wartość `field_length`, co prowadzi do awarii urządzenia.
Risk Assessment
Organizacja narażona jest na ataki, które mogą prowadzić do niedostępności urządzeń ESPHome, szczególnie gdy nie jest włączone szyfrowanie API. Atak może być przeprowadzony bez uwierzytelnienia, co zwiększa ryzyko.
Recommendation
Zaleca się aktualizację do wersji ESPHome 2025.12.7 lub nowszej, włączenie szyfrowania API z unikalnym kluczem dla każdego urządzenia oraz przestrzeganie najlepszych praktyk bezpieczeństwa.
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Original NVD description (English source)
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 + field_length > end` in `components/api/proto.cpp` can overflow when a malicious client sends a large `field_length` value. This affects all ESPHome device platforms (ESP32, ESP8266, RP2040, LibreTiny). The overflow bypasses the out-of-bounds check, causing the device to read invalid memory and crash. When using the plaintext API protocol, this attack can be performed without authentication. When noise encryption is enabled, knowledge of the encryption key is required. Users should upgrade to ESPHome 2025.12.7 or later to receive a patch, enable API encryption with a unique key per device, and follow the Security Best Practices.

