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diff --git a/web/core/lib/Drupal/Core/EventSubscriber/RenderArrayNonHtmlSubscriber.php b/web/core/lib/Drupal/Core/EventSubscriber/RenderArrayNonHtmlSubscriber.php
new file mode 100644
index 000000000..afb9ef5b0
--- /dev/null
+++ b/web/core/lib/Drupal/Core/EventSubscriber/RenderArrayNonHtmlSubscriber.php
@@ -0,0 +1,42 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent;
+use Symfony\Component\HttpKernel\Exception\NotAcceptableHttpException;
+use Symfony\Component\HttpKernel\KernelEvents;
+
+/**
+ * Throws 406 if requesting non-HTML format and controller returns render array.
+ */
+class RenderArrayNonHtmlSubscriber implements EventSubscriberInterface {
+
+  /**
+   * Throws an HTTP 406 error if client requested a non-HTML format.
+   *
+   * @param \Symfony\Component\HttpKernel\Event\GetResponseForControllerResultEvent $event
+   *   The event to process.
+   */
+  public function onRespond(GetResponseForControllerResultEvent $event) {
+    $request = $event->getRequest();
+    $result = $event->getControllerResult();
+
+    // If this is a render array then we assume that the router went with the
+    // generic controller and not one with a format. If the format requested is
+    // not HTML though, we can also assume that the requested format is invalid
+    // so we provide a 406 response.
+    if (is_array($result) && $request->getRequestFormat() !== 'html') {
+      throw new NotAcceptableHttpException('Not acceptable format: ' . $request->getRequestFormat());
+    }
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function getSubscribedEvents() {
+    $events[KernelEvents::VIEW][] = ['onRespond', -10];
+    return $events;
+  }
+
+}