   public Object unmarshal(InputSource source) throws JAXBException
   {
       try
       {
          SAXParserFactory spf = SAXParserFactory.newInstance();
          SAXParser sp = spf.newSAXParser();
          XMLReader xmlReader = sp.getXMLReader();
          xmlReader.setFeature("http://xml.org/sax/features/validation", false);
          xmlReader.setFeature("http://xml.org/sax/features/external-general-entities", false);
          xmlReader.setFeature("http://xml.org/sax/features/external-parameter-entities", false);
          xmlReader.setFeature("http://xml.org/sax/features/namespaces", true);
          SAXSource saxSource = new SAXSource(xmlReader, source);
          return delegate.unmarshal(saxSource);
      }
      catch (SAXException e)
      {
         throw new JAXBException(e);
      }
      catch (ParserConfigurationException e)
      {
         throw new JAXBException(e);
      }
   }

NVD is only using a subset of CWE for mapping instead of the entire CWE, and the weakness type is not covered by that subset.