http://www.openwall.com/lists/oss-security/2016/06/25/4
http://www.openwall.com/lists/oss-security/2017/01/20/16
http://www.securityfocus.com/bid/91459
https://access.redhat.com/errata/RHSA-2019:0269
https://access.redhat.com/errata/RHSA-2019:0270
https://bugzilla.mozilla.org/show_bug.cgi?id=1275400
https://github.com/libical/libical/issues/235
https://github.com/libical/libical/issues/251
https://github.com/libical/libical/issues/286
https://security.gentoo.org/glsa/201904-02
https://security.gentoo.org/glsa/201904-07
https://usn.ubuntu.com/3897-1/
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