box_recv(PG_FUNCTION_ARGS)
{
	StringInfo	buf = (StringInfo) PG_GETARG_POINTER(0);
	BOX		   *box;
	double		x,
				y;

	box = (BOX *) palloc(sizeof(BOX));

	box->high.x = pq_getmsgfloat8(buf);
	box->high.y = pq_getmsgfloat8(buf);
	box->low.x = pq_getmsgfloat8(buf);
	box->low.y = pq_getmsgfloat8(buf);

	/* reorder corners if necessary... */
	if (box->high.x < box->low.x)
	{
		x = box->high.x;
		box->high.x = box->low.x;
		box->low.x = x;
	}
	if (box->high.y < box->low.y)
	{
		y = box->high.y;
		box->high.y = box->low.y;
		box->low.y = y;
	}

	PG_RETURN_BOX_P(box);
}

This weakness involves numeric computation errors, such as integer overflows, underflows, or precision losses, which can lead to miscalculations and exploitable behaviors in software.