CVE-2026-62966 ESPAsyncWebServer multipart parser has null-pointer write

ESPAsyncWebServer is an asynchronous HTTP and WebSocket server library for ESP32, ESP8266, RP2040 and RP2350. Prior to version 3.11.2, the multipart parser in src/WebRequest.cpp frees itemBuffer and sets it to NULL when BOUNDARYORDATA matches the closing boundary of a file part, before confirming...