diff --git a/ext/fileinfo/tests/gh13344.phpt b/ext/fileinfo/tests/gh13344.phpt
new file mode 100644
index 00000000000..a2074af8a0b
--- /dev/null
+++ b/ext/fileinfo/tests/gh13344.phpt
@@ -0,0 +1,12 @@
+--TEST--
+GH-13344 (finfo::buffer(): Failed identify data 0:(null))
+--EXTENSIONS--
+fileinfo
+--FILE--
+<?php
+$data = pack('H*','fffe000000099999');
+$mime_type = (new finfo(FILEINFO_MIME))->buffer($data);
+echo $mime_type;
+?>
+--EXPECT--
+application/octet-stream; charset=utf-32le