The following updates has been released for Debian GNU/Linux:
Debian GNU/Linux 7 LTS:Libidn / Libgd2 / StrongSwan Updates for Debian
DLA 1084-1: libidn security update
DLA 1085-1: libidn2-0 security update
Debian GNU/Linux 8 and 9:
DSA 3961-1: libgd2 security update
DSA 3962-1: strongswan security update