A use-after-free vulnerability was found in libical which allows to read heap memory. References: http://seclists.org/oss-sec/2016/q4/686
Created thunderbird tracking bugs for this issue: Affects: fedora-all [bug 1375122]
Created libical tracking bugs for this issue: Affects: fedora-all [bug 1375121] Affects: epel-5 [bug 1375123]