--- old/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java	2017-12-13 14:47:27.852307000 +0530
+++ new/src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java	2017-12-13 14:47:27.468115000 +0530
@@ -736,6 +736,17 @@
 
                 switch (chunkType) {
                 case IDAT_TYPE:
+                    /*
+                     * PNG specification mandates that if colorType is
+                     * PNG_COLOR_PALETTE then PLTE chunk should appear before
+                     * the first IDAT chunk.
+                     */
+                    if (colorType == PNG_COLOR_PALETTE &&
+                        metadata.PLTE_present == false)
+                    {
+                        throw new IIOException("PNG Header doesn't contain"
+                                + " required PLTE chunk");
+                    }
                     // If chunk type is 'IDAT', we've reached the image data.
                     if (imageStartPosition == -1L) {
                         /*