CVE-2026-42855

The vulnerability affects the arduino-esp32 core (WebServer Digest authentication). Before version 3.3.8, the Digest auth hash is computed from the URI field in the Authorization header without validating it against the actually requested URI. As a result, an attacker with any valid digest respon...

CVE-2025-53540 CSRF Vulnerability in Firmware Update Endpoints Allows Remote Code Execution

arduino-esp32 is an Arduino core for the ESP32, ESP32-S2, ESP32-S3, ESP32-C3, ESP32-C6 and ESP32-H2 microcontrollers. Several OTA update examples and the HTTPUpdateServer implementation are vulnerable to Cross-Site Request Forgery CSRF. The update endpoints accept POST requests for firmware uploa...