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 writeData(LPDataOutput output) throws IOException {
		super.writeData(output);
		if (stack == null) {
			output.writeBoolean(false);
		} else {
			output.writeBoolean(true);
			output.writeItemIdentifierStack(stack);
		}
	}