The OAuth implementation in librest before 0.7.93 incorrectly truncates the pointer returned by the rest_proxy_call_get_url function, which allows remote attackers to cause a denial of service (application crash) via running the EnsureCredentials method from the org.gnome.OnlineAccounts.Account interface on an object representing a Flickr account.
https://git.gnome.org/browse/librest/commit/?id=b50ace7738ea03817acdad87fb2b338a86018329
https://bugzilla.redhat.com/show_bug.cgi?id=1199049
https://bugzilla.redhat.com/show_bug.cgi?id=1183982
https://bugzilla.gnome.org/show_bug.cgi?id=742644