diff --git a/core/modules/editor/src/Plugin/Filter/EditorFileReference.php b/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
index 3ea6982e5b9..e41901f7c41 100644
--- a/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
+++ b/core/modules/editor/src/Plugin/Filter/EditorFileReference.php
@@ -4,6 +4,7 @@ namespace Drupal\editor\Plugin\Filter;
 
 use Drupal\Component\Utility\Html;
 use Drupal\Core\Entity\EntityRepositoryInterface;
+use Drupal\Core\Image\ImageFactory;
 use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
 use Drupal\file\FileInterface;
 use Drupal\filter\FilterProcessResult;
@@ -31,6 +32,13 @@ class EditorFileReference extends FilterBase implements ContainerFactoryPluginIn
    */
   protected $entityRepository;
 
+  /**
+   * The image factory.
+   *
+   * @var \Drupal\Core\Image\ImageFactory
+   */
+  protected $imageFactory;
+
   /**
    * Constructs a \Drupal\editor\Plugin\Filter\EditorFileReference object.
    *
@@ -42,9 +50,12 @@ class EditorFileReference extends FilterBase implements ContainerFactoryPluginIn
    *   The plugin implementation definition.
    * @param \Drupal\Core\Entity\EntityRepositoryInterface $entity_repository
    *   The entity repository.
+   * @param \Drupal\Core\Image\ImageFactory $image_factory
+   *   The image factory.
    */
-  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityRepositoryInterface $entity_repository) {
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, EntityRepositoryInterface $entity_repository, ImageFactory $image_factory) {
     $this->entityRepository = $entity_repository;
+    $this->imageFactory = $image_factory;
     parent::__construct($configuration, $plugin_id, $plugin_definition);
   }
 
@@ -56,7 +67,8 @@ class EditorFileReference extends FilterBase implements ContainerFactoryPluginIn
       $configuration,
       $plugin_id,
       $plugin_definition,
-      $container->get('entity.repository')
+      $container->get('entity.repository'),
+      $container->get('image.factory')
     );
   }
 
@@ -83,7 +95,9 @@ class EditorFileReference extends FilterBase implements ContainerFactoryPluginIn
               // Without dimensions specified, layout shifts can occur,
               // which are more noticeable on pages that take some time to load.
               // As a result, only mark images as lazy load that have dimensions.
-              [$width, $height] = @getimagesize($file->getFileUri());
+              $image = $this->imageFactory->get($file->getFileUri());
+              $width = $image->getWidth();
+              $height = $image->getHeight();
               if ($width !== NULL && $height !== NULL) {
                 if (!$node->hasAttribute('width')) {
                   $node->setAttribute('width', $width);