Arbitrary code execution via shallow Value assignment

Memory corruption in hjiang JSON++ 1.0.1 and earlier allows attackers to execute arbitrary code through unsafe Value assignment. The Value class uses its default assignment operator for owning pointer members, causing two values to alias storage without duplicating or transferring ownership and leaving a dangling pointer when either value is destroyed. Exploitation requires a host program to assign attacker-influenced parsed values through this path; the corruption can crash the process or permit code execution in that program's context.