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 writeBitSet(BitSet bits) throws IOException {
		if (bits == null) {
			throw new NullPointerException("BitSet may not be null");
		}
		writeByteArray(bits.toByteArray());
	}