PYSEC-2026-1330 ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header

Summary On the ESP-IDF platform, ESPHome's webserver authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correct value e.g., correct username with partial password. This allows access to webserver functionality...

ESPHome - Authentication Bypass

ESPHome 2025.8.0 contains an authentication bypass caused by improper validation of base64-encoded Authorization values in the webserver component, letting attackers access functionality without valid credentials, exploit requires crafted Authorization header. id: CVE-2025-57808 info: name: ESPHo...

CVE-2026-23833

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...

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...

ESPHome Input Validation Vulnerability

ESPHome is an open-source system for configuring and managing smart hardware. It is used to control Esp8266/Esp32 hardware, enabling home automation control. The version 2025.9.0 to 2025.12.6 of ESPHome contains a vulnerability related to input validation errors. This vulnerability stems from...

CVE-2025-57808 ESP-IDF web_server basic auth bypass using empty or incomplete Authorization header

ESPHome is a system to control microcontrollers remotely through Home Automation systems. In version 2025.8.0 in the ESP-IDF platform, ESPHome's webserver authentication check can pass incorrectly when the client-supplied base64-encoded Authorization value is empty or is a substring of the correc...

CVE-2021-41104

ESPHome is a system to control the ESP8266/ESP32. Anyone with webserver enabled and HTTP basic auth configured on version 2021.9.1 or older is vulnerable to an issue in which webserver allows over-the-air OTA updates without checking user defined basic auth username & password. This issue is...