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

*** 734,743 ****
--- 734,754 ----
                      throw new IIOException("Invalid chunk length " + chunkLength);
                  }
  
                  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) {
                          /*
                           * PNGs may contain multiple IDAT chunks containing
                           * a portion of image data. We store the position of