The am_read_post_data function in mod_auth_mellon before 0.11.1 does not check if the ap_get_client_block function returns an error, which allows remote attackers to cause a denial of service (segmentation fault and process crash) via a crafted POST data.
https://sympa.uninett.no/lists/uninett.no/arc/modmellon/2016-03/msg00000.html
https://github.com/UNINETT/mod_auth_mellon/pull/71
http://lists.fedoraproject.org/pipermail/package-announce/2016-March/179085.html