Provide references for CVE-2016-3981.
Where can I find more information about CVE-2016-3981?
References are available at: http://bugs.fi/media/afl/optipng/1/, https://sourceforge.net/p/optipng/bugs/56/, http://lists.opensuse.org/opensuse-updates/2016-04/msg00065.html, http://www.debian.org/security/2016/dsa-3546, http://www.ubuntu.com/usn/USN-2951-1, http://lists.opensuse.org/opensuse-updates/2016-04/msg00061.html, https://security.gentoo.org/glsa/201608-01.