elflink.c in the Binary File Descriptor (BFD) library (aka libbfd), as distributed in GNU Binutils 2.28, has a "member access within null pointer" undefined behavior issue, which might allow remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact via an "int main() {return 0;}" program.
https://security.gentoo.org/glsa/201709-02
https://blogs.gentoo.org/ago/2017/04/05/binutils-two-null-pointer-dereference-in-elflink-c/