GHSA-WC9J-GC65-3CM7 DDFFileParser is vulnerable to XXE Attacks

Impact DDFFileParser and DefaultDDFFileValidator and so ObjectLoader are vulnerable to XXE AttacksProcessing. DDF file is a LWM2M format used to store LWM2M object description. Leshan users are impacted only if they parse untrusted DDF files e.g. if they let external users provide their own model...