diff --git a/lib/internal/Magento/Framework/Config/Dom.php b/lib/internal/Magento/Framework/Config/Dom.php
index 4f512fd7820a5..0244ab10ede13 100644
--- a/lib/internal/Magento/Framework/Config/Dom.php
+++ b/lib/internal/Magento/Framework/Config/Dom.php
@@ -274,7 +274,8 @@ public static function validateDomDocument(
         $schema = self::$urnResolver->getRealPath($schema);
         libxml_use_internal_errors(true);
         try {
-            if (file_exists($schema)) {
+            // 4096 is the maximum length allowed by file_exists for the filename
+            if (strlen($schema) < 4096 && file_exists($schema)) {
                 $result = $dom->schemaValidate($schema);
             } else {
                 $result = $dom->schemaValidateSource($schema);