Provide references for CVE-2018-18661.
Where can I find more information about CVE-2018-18661?
References are available at: https://usn.ubuntu.com/3864-1/, http://bugzilla.maptools.org/show_bug.cgi?id=2819, http://www.securityfocus.com/bid/105762, https://access.redhat.com/errata/RHSA-2019:2053, https://lists.debian.org/debian-lts-announce/2019/11/msg00027.html.