libical 1.0 allows remote attackers to cause a denial of service (use-after-free) via a crafted ics file (CVE-2016-5824).
The icaltimefromstring function in libical 0.47 and 1.0 allows remote attackers to cause a denial of service (out-of-bounds heap read) via a crafted string to the icalparserparsestring function (CVE-2016-5827).
libical allows remote attackers to cause a denial of service (use-after-free) and possibly read heap memory via a crafted ics file (CVE-2016-9584).