Index: feed.php
===================================================================
--- feed.php	(revision 4401)
+++ feed.php	(working copy)
@@ -135,9 +135,9 @@
 	foreach ( (array) $categories as $category ) {
 		$category->cat_name = convert_chars($category->cat_name);
 		if ( 'rdf' == $type )
-			$the_list .= "\n\t\t<dc:subject>$category->cat_name</dc:subject>\n";
+			$the_list .= "\n\t\t<dc:subject><![CDATA[$category->cat_name]]></dc:subject>\n";
 		else
-			$the_list .= "\n\t\t<category>$category->cat_name</category>\n";
+			$the_list .= "\n\t\t<category><![CDATA[$category->cat_name]]></category>\n";
 	}
 	return apply_filters('the_category_rss', $the_list, $type);
 }