diff --git a/src/hb-ot-color-sbix-table.hh b/src/hb-ot-color-sbix-table.hh
index af1e4a5dbeb03add0b8317c5d55ebd94d37a6f53..e085ee0d6e980ad28cfce787d9d915af92b76e04 100644
--- a/src/hb-ot-color-sbix-table.hh
+++ b/src/hb-ot-color-sbix-table.hh
@@ -298,6 +298,12 @@ struct sbix
 
       const PNGHeader &png = *blob->as<PNGHeader>();
 
+      if ((png.IHDR.height >= 65536) | (png.IHDR.width >= 65536))
+      {
+        hb_blob_destroy (blob);
+        return false;
+      }
+
       extents->x_bearing = x_offset;
       extents->y_bearing = png.IHDR.height + y_offset;
       extents->width     = png.IHDR.width;