I18N: Add hardening for invalid meta lines in MO files.

Props swissspidy, pander.
Fixes #61794.
Built from https://develop.svn.wordpress.org/trunk@58922


git-svn-id: http://core.svn.wordpress.org/trunk@58318 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/l10n/class-wp-translation-file-mo.php

@@ -154,7 +154,7 @@ class WP_Translation_File_MO extends WP_Translation_File {
 			// Metadata about the MO file is stored in the first translation entry.
 			if ( '' === $original ) {
 				foreach ( explode( "\n", $translation ) as $meta_line ) {
-					if ( '' === $meta_line ) {
+					if ( '' === $meta_line || ! str_contains( $meta_line, ':' ) ) {
 						continue;
 					}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.7-alpha-58921';
+$wp_version = '6.7-alpha-58922';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.