Language: Java
Label: vulnerable
CWE: CWE-502 \u2014 Deserialization of Untrusted Data
The product deserializes untrusted data without sufficiently verifying that the resulting data will be valid.

Code:
	public void writeItemStack(ItemStack itemstack) throws IOException {
		if (itemstack == null) {
			writeInt(0);
		} else {
			writeInt(Item.getIdFromItem(itemstack.getItem()));
			writeInt(itemstack.stackSize);
			writeInt(itemstack.getItemDamage());
			writeNBTTagCompound(itemstack.getTagCompound());
		}
	}