ADDITIONAL SYSTEM INFORMATION :
Tested on Ubuntu 18.04 (input should have windows line endings), Windows 7

Affected JVMs:

java version "10.0.2" 2018-07-17
Java(TM) SE Runtime Environment 18.3 (build 10.0.2+13)
Java HotSpot(TM) 64-Bit Server VM 18.3 (build 10.0.2+13, mixed mode)

openjdk version "10.0.1" 2018-04-17
OpenJDK Runtime Environment (build 10.0.1+10-Ubuntu-3ubuntu1)
OpenJDK 64-Bit Server VM (build 10.0.1+10-Ubuntu-3ubuntu1, mixed mode)

A DESCRIPTION OF THE PROBLEM :
Stax parser fails under specific circumstances.
Attached is a minimal sample of an XML input (with parsing code), that parses successfully in Java 1.8, but fails in Java 10.
If any character is removed from sample, problem disappears.
Length of text elements is important.

Sample looks synthetic due to minimization effort.

REGRESSION : Last worked in version 8u181

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
Execute attached test case

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
No exceptions logged
ACTUAL -
Exception in thread "main" java.util.NoSuchElementException: ParseError at [row,col]:[182,3]
Message: The element type "Data" must be terminated by the matching end-tag "</Data>".
at java.xml/com.sun.xml.internal.stream.XMLEventReaderImpl.next(XMLEventReaderImpl.java:252)
at java.base/java.util.Iterator.forEachRemaining(Iterator.java:133)
at xmlvalidator.NestedCdata.stax(NestedCdata.java:135)
at xmlvalidator.NestedCdata.main(NestedCdata.java:127)

---------- BEGIN SOURCE ----------
package xmlvalidator;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.nio.charset.StandardCharsets;
import java.util.Iterator;

import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.FactoryConfigurationError;
import javax.xml.stream.XMLEventReader;
import javax.xml.stream.XMLInputFactory;
import javax.xml.stream.XMLStreamException;

import org.xml.sax.SAXException;

public class NestedCdata {

public static void main(String[] args) throws IOException, XMLStreamException, ParserConfigurationException, SAXException {
String xml = "<Export generator=\"Cache\" version=\"25\">\r\n"
+ "<Class name=\"DSVRDemo.ConditionalBannerLIDR\">\r\n" + "<Description>\r\n" + "</Description>\r\n"
+ "<Parameter name=\"XSLTMODE\">\r\n" + "</Parameter>\r\n" + "<Parameter name=\"DSSHOME\">\r\n"
+ "</Parameter>\r\n" + "<Parameter name=\"DSSCLASS\">\r\n" + "</Parameter>\r\n"
+ "<XData name=\"ReportModel\">\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"box\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"box\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n"
+ "{t:\"txt\",gc:\r\n" + "{t:\"txt\",gc:\r\n" + "<Data><![CDATA[\r\n" + "<pageheader>\r\n"
+ "<![CDATA[\r\n" + "</svg:text>\r\n"
+ "<svg:text x=\"0\" y=\"30.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "Run by:\r\n" + "</svg:text>\r\n" + "<xsl:value-of select=\"@Genre\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:text x=\"0\" y=\"19.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "Genre:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"70\" y=\"0\" width=\"86\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"70\" y=\"8.333333333333334\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"0\" width=\"70\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"0\" y=\"8.333333333333334\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "Run time:\r\n" + "</svg:text>\r\n"
+ "<svg:line x1=\"0\" y1=\"34\" x2=\"466\" y2=\"34\" style=\"stroke:#000000;stroke-width:2;stroke-opacity:1\" />\r\n"
+ "</svg:svg>\r\n" + "</fo:instream-foreign-object>\r\n" + "</fo:block>\r\n" + "]]]]><![CDATA[>\r\n"
+ "<!-- end of PAGE HEADER -->\r\n" + "<pagefooter>\r\n" + "<!-- PAGE FOOTER -->\r\n" + "<write>\r\n"
+ "<![CDATA[\r\n" + "<fo:block font-size=\"0pt\" >\r\n" + "<fo:instream-foreign-object>\r\n"
+ "<svg:svg width=\"468pt\" height=\"37pt\" viewBox=\"0 0 468 37\" >\r\n"
+ "<svg:line x1=\"0\" y1=\"1\" x2=\"466\" y2=\"1\" style=\"stroke:#000000;stroke-width:2;stroke-opacity:1\" />\r\n"
+ "<svg:rect x=\"70\" y=\"2\" width=\"86\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<xsl:value-of select=\"@runBy\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"2\" width=\"70\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"0\" y=\"10.333333333333334\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:rect x=\"70\" y=\"13\" width=\"86\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "</svg:text>\r\n"
+ "<svg:text x=\"0\" y=\"21.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:rect x=\"70\" y=\"24\" width=\"86\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"70\" y=\"32.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"24\" width=\"70\" height=\"11\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"0\" y=\"32.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "Run time:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"312\" y=\"23\" width=\"156\" height=\"12\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"468\" y=\"31.333333333333336\" style=\"font-size:10;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "Annotated Box Office\r\n" + "</svg:text>\r\n" + "</fo:instream-foreign-object>\r\n"
+ "</fo:block>\r\n" + "<!-- end of PAGE FOOTER -->\r\n" + "</pagefooter>\r\n" + "<body>\r\n"
+ "<write>\r\n" + "<![CDATA[\r\n" + "<fo:block font-size=\"0pt\" >\r\n"
+ "<svg:svg width=\"468pt\" height=\"205pt\" viewBox=\"0 0 468 205\" >\r\n"
+ "<svg:rect x=\"1\" y=\"73\" width=\"466\" height=\"126\" style=\"fill-opacity:1;fill:#ffffff;stroke:#000000;stroke-width:2;stroke-opacity:1\" />\r\n"
+ "<svg:rect x=\"0\" y=\"74\" width=\"468\" height=\"44\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "Annotated Box Office\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"246\" y=\"118\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"246\" y=\"129.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"118\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"222\" y=\"129.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "Run by:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"246\" y=\"134\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "</svg:text>\r\n"
+ "<svg:text x=\"222\" y=\"145.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "Genre:\r\n"
+ "<svg:rect x=\"246\" y=\"150\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"246\" y=\"161.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "<xsl:value-of select=\"@runTime\"/>\r\n"
+ "<svg:rect x=\"0\" y=\"150\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "Run time:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"246\" y=\"166\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"246\" y=\"177.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "<xsl:value-of select=\"TotalTicketsSold\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"166\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"222\" y=\"177.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "Total tickets sold:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"246\" y=\"182\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"246\" y=\"193.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "<xsl:value-of select=\"TotalFilms\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"182\" width=\"222\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"222\" y=\"193.66666666666666\" style=\"font-size:14;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "Total films:\r\n" + "</svg:text>\r\n" + "</svg:svg>\r\n" + "]]]]><![CDATA[>\r\n" + "</write>\r\n"
+ "<pagebreak/>\r\n" + "<!-- end of REPORT HEADER -->\r\n" + "<group name='FilmsByGenre' >\r\n"
+ "<!-- GROUP HEADER (FilmsByGenre) -->\r\n" + "<write>\r\n" + "<![CDATA[\r\n"
+ "<fo:block font-size=\"0pt\" >\r\n" + "<fo:instream-foreign-object>\r\n"
+ "<svg:svg width=\"468pt\" height=\"74pt\" viewBox=\"0 0 468 74\" >\r\n"
+ "<svg:text x=\"78\" y=\"55\" style=\"font-size:12;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "<xsl:value-of select=\"TitleCount\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"0\" y=\"45\" width=\"78\" height=\"14\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"0\" y=\"55\" style=\"font-size:12;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "Title count:\r\n" + "</svg:text>\r\n"
+ "<svg:rect x=\"156\" y=\"24\" width=\"156\" height=\"21\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<xsl:value-of select=\"@CategoryName\"/>\r\n" + "</svg:text>\r\n"
+ "<svg:text x=\"468\" y=\"55\" style=\"font-size:12;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "<svg:rect x=\"312\" y=\"45\" width=\"78\" height=\"14\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"390\" y=\"55\" style=\"font-size:12;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;text-anchor:end;\" >\r\n"
+ "</svg:text>\r\n"
+ "<svg:line x1=\"0\" y1=\"60\" x2=\"466\" y2=\"60\" style=\"stroke:#000000;stroke-width:2;stroke-opacity:1\" />\r\n"
+ "</svg:svg>\r\n" + "</fo:instream-foreign-object>\r\n" + "</fo:block>\r\n" + "]]]]><![CDATA[>\r\n"
+ "</write>\r\n" + "<group name='FilmDetail' >\r\n" + "<!-- REPORT BODY (FilmDetail) -->\r\n"
+ "<write>\r\n" + "<![CDATA[\r\n" + "<fo:block font-size=\"0pt\">\r\n"
+ "<fo:instream-foreign-object>\r\n"
+ "<svg:svg width=\"468pt\" height=\"71pt\" viewBox=\"0 0 468 71\" >\r\n"
+ "<svg:rect x=\"3\" y=\"4\" width=\"257\" height=\"16\" style=\"fill:#ffffff;fill-opacity:0;stroke-width:0;\" />\r\n"
+ "<svg:text x=\"3\" y=\"14\" style=\"font-size:12;font-family:sans-serif;fill:#000000;fill-opacity:1;font-weight:bold;\" >\r\n"
+ "</svg:text>\r\n" + "</report>]]></Data>\r\n" + "</XData>\r\n" + "</Class>\r\n" + "</Export>\r\n";
try (ByteArrayInputStream inputStream = new ByteArrayInputStream(xml.getBytes(StandardCharsets.UTF_8))) {
stax(inputStream);
}

}

private static void stax(InputStream input) throws XMLStreamException, FactoryConfigurationError {
XMLEventReader events = XMLInputFactory.newInstance()
.createXMLEventReader(input);
((Iterator<?>) events).forEachRemaining(ignored -> {
});
}
}

---------- END SOURCE ----------

CUSTOMER SUBMITTED WORKAROUND :
1. Use DOM or SAX parsers.
2. Use Java 1.8 or older
3. Don't use Windows line endings in XML

FREQUENCY : always