UBUNTU-CVE-2026-121388: High severity ubuntu/freerdp vulnerability

FreeRDP from 3.0.0 before 3.32.2 contains an uncontrolled resource allocation vulnerability that allows malicious RDP servers to force large client allocations through the DRDYNVC DATAFIRST Length field. Attackers can declare lengths up to 4,294,967,295 bytes on running dynamic channels, causing StreamPoolTake to reserve memory before body validation and exhaust client memory.