diff --git a/inc/Data/Driver/Metadata/PngExifReader.php b/inc/Data/Driver/Metadata/PngExifReader.php
index 07a9cd7c..726c5214 100644
--- a/inc/Data/Driver/Metadata/PngExifReader.php
+++ b/inc/Data/Driver/Metadata/PngExifReader.php
@@ -4,7 +4,8 @@ namespace Vichan\Data\Driver\Metadata;
 
 class PngExifReader implements ExifReader {
 	// Chunks larger than this will be ignored.
-	private const MAX_CHUNK_SIZE = 1048576; // 1 MB
+	private const MAX_CHUNK_SIZE = 1048576; // 1 MB.
+	private const MAX_CHUNK_COUNT = 32; // 1 MB
 	private const ORIENTATION_TAG_ID = 0x0112;
 	// Exif data type identifier.
 	private const TYPE_SHORT = 0x3;
@@ -111,7 +112,7 @@ class PngExifReader implements ExifReader {
 		// Loop through the PNG's chunks. Byte 0-3 is length, Byte 4-7 is type.
 		$chunkHeader = \fread($fd, 8);
 
-		while ($chunkHeader) {
+		for ($i = 0; $chunkHeader && $i < self::MAX_CHUNK_COUNT; $i++) {
 			// Extract length and type from binary data.
 			$chunk = @\unpack('Nsize/a4type', $chunkHeader);