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 writeItemIdentifier(ItemIdentifier item) throws IOException {
		if (item == null) {
			writeInt(0);
		} else {
			writeInt(Item.getIdFromItem(item.item));
			writeInt(item.itemDamage);
			writeNBTTagCompound(item.tag);
		}
	}