Language: Java
Label: vulnerable
CWE: CWE-611 \u2014 Improper Restriction of XML External Entity Reference
The product processes an XML document that can contain XML entities with URIs that resolve to documents outside of the intended sphere of control, causing the product to embed incorrect documents into its output.

Code:
	public String toString() {
		StringBuilder builder = new StringBuilder();
		synchronized (fLock) {
			try {
				ByteArrayOutputStream stream = new ByteArrayOutputStream();
				Transformer transformer = TransformerFactory.newInstance().newTransformer();
				// Indentation is done with XmlUtil.prettyFormat(doc).
				// For debugging, the prettyFormat may not have been run yet,
				// so turning this to "yes" may be helpful on occasion.
				transformer.setOutputProperty(OutputKeys.INDENT, "no"); //$NON-NLS-1$

				DOMSource source = new DOMSource(fElement);
				StreamResult result = new StreamResult(stream);
				transformer.transform(source, result);
				builder.append(stream.toString());

			} catch (Exception e) {
				return fElement.toString();
			}
		}
		return builder.toString();
	}