diff -rupN kio-extras-19.12.3/thumbnail/imagecreator.cpp kio-extras-19.12.3-new/thumbnail/imagecreator.cpp

--- kio-extras-19.12.3/thumbnail/imagecreator.cpp	2020-03-03 20:33:29.000000000 +0100

+++ kio-extras-19.12.3-new/thumbnail/imagecreator.cpp	2020-04-17 03:13:31.630526008 +0200

@@ -34,6 +34,9 @@ bool ImageCreator::create(const QString

 {

     // create image preview

     QImageReader ir(path);

+    QSize sz = ir.size();

+    if(sz.width() > 10240 || sz.height() > 10240)

+        return false;

     ir.setDecideFormatFromContent(true);

     img = ir.read();

     if (img.isNull())