The "go get" implementation in Go 1.9.4, when the -insecure command-line option is used, does not validate the import path (get/vcs.go only checks for "://" anywhere in the string), which allows remote attackers to execute arbitrary OS commands via a crafted web site.
https://www.debian.org/security/2019/dsa-4380
https://www.debian.org/security/2019/dsa-4379
https://security.gentoo.org/glsa/201804-12
https://lists.debian.org/debian-lts-announce/2018/02/msg00029.html
https://github.com/golang/go/issues/23867
https://gist.github.com/SLAYEROWNER/b2a358f13ab267f2e9543bb9f9320ffc