fits-io.c in GIMP before 2.8.1 allows remote attackers to cause a denial of service (NULL pointer dereference and application crash) via a malformed XTENSION header of a .fit file, as demonstrated using a long string.
https://exchange.xforce.ibmcloud.com/vulnerabilities/76658
https://bugzilla.gnome.org/show_bug.cgi?id=676804
http://www.ubuntu.com/usn/USN-1559-1
http://lists.opensuse.org/opensuse-security-announce/2012-09/msg00000.html