src/java.desktop/share/classes/com/sun/imageio/plugins/png/PNGImageReader.java

@@ -737,10 +737,21 @@
                 switch (chunkType) {
                 case IDAT_TYPE:
                     // If chunk type is 'IDAT', we've reached the image data.
                     if (imageStartPosition == -1L) {
                         /*
+                         * 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 image doesn't contain"
+                                    + " required PLTE chunk");
+                        }
+                        /*
                          * PNGs may contain multiple IDAT chunks containing
                          * a portion of image data. We store the position of
                          * the first IDAT chunk and continue with iteration
                          * of other chunks that follow image data.
                          */