Merge pull request #2819 from apache/mango-bookmark-2.3.x

safer binary_to_term in mango_json_bookmark
diff --git a/src/mango/src/mango_json_bookmark.erl b/src/mango/src/mango_json_bookmark.erl
index 97f81cf..83fd00f 100644
--- a/src/mango/src/mango_json_bookmark.erl
+++ b/src/mango/src/mango_json_bookmark.erl
@@ -54,7 +54,7 @@
     nil;
 unpack(Packed) ->
     try
-        Bookmark = binary_to_term(couch_util:decodeBase64Url(Packed)),
+        Bookmark = binary_to_term(couch_util:decodeBase64Url(Packed), [safe]),
         verify(Bookmark)
     catch _:_ ->
         ?MANGO_ERROR({invalid_bookmark, Packed})