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Posted to c-dev@xerces.apache.org by "Benjamin Fritz (Jira)" <xe...@xml.apache.org> on 2022/09/08 22:05:00 UTC
[jira] [Updated] (XERCESC-2240) Junk characters (including null) allowed in XML declaration
[ https://issues.apache.org/jira/browse/XERCESC-2240?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Benjamin Fritz updated XERCESC-2240:
------------------------------------
Attachment: basic_bad_bytes.xml
basic_bad_bytes2.xml
> 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
> 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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