CVE-2026-13214 Stack buffer overflow in OCPP GetConfiguration key parsing

The OCPP 1.6 client in subsys/net/lib/ocpp/ocppj.c contains a stack buffer overflow in parsegetconfigmsg. When handling a GetConfiguration request from the central system, the handler copied the attacker-controlled JSON "key" string into the caller's fixed 50-byte stack buffer skeyCISTR50, declar...