Heap-based buffer overflow in the pack function in Perl before 5.26.2 allows context-dependent attackers to execute arbitrary code via a large item count.
https://lists.debian.org/debian-lts-announce/2018/04/msg00009.html
https://security.gentoo.org/glsa/201909-01
https://usn.ubuntu.com/3625-1/
https://usn.ubuntu.com/3625-2/
https://www.debian.org/security/2018/dsa-4172