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https://issues.apache.org/jira/browse/XERCESC-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17613049#comment-17613049
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Scott Cantor commented on XERCESC-2240:
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Unless somebody who knows the code better can propose a patch I definitely
don't see much that I could do about this.
> Junk characters (including null) allowed in XML declaration
> -----------------------------------------------------------
>
> Key: XERCESC-2240
> URL: https://issues.apache.org/jira/browse/XERCESC-2240
> Project: Xerces-C++
> Issue Type: Bug
> Components: Non-Validating Parser
> Affects Versions: 3.2.3
> Environment: Linux
> Reporter: Benjamin Fritz
> Priority: Minor
> Attachments: basic_bad_bytes.xml, basic_bad_bytes2.xml
>
>
> In a library we've written using Xerces-C++ to validate XML files against a
> given XSD, we have discovered that the XercesDOMParser::parse() function does
> not record any errors if the XML declaration at the beginning of an XML
> document contains "junk" characters, including control characters (^K) or
> null bytes. The null control character specifically should be invalid in any
> XML document. I.e. the following XML file (attaching as basic_bad_bytes.xml)
> parses without error, but it should not:
> <?xml version="1.0" encoding^@\^@\^@\^@\^@="UTF-8" ?>
> <root_elem>
> <child_elem some_attr="abc" />
> <child_elem some_attr="def" />
> </root_elem>
> The following XML (attaching as basic_bad_bytes2.xml) correctly reports an
> error:
> <?xml version="1.0" encoding="UTF-8" ?>
> <root_elem^@\^@\^@\^@\^@>
> <child_elem some_attr="abc" />
> <child_elem some_attr="def" />
> </root_elem>
> This is similar to XERCESC-1701, where the end of the document after the root
> element was found to allow "junk" characters during parsing.
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