Attacker gains access to victim memory. High-risk vunerability. https://eyalitkin.wordpress.com/2017/12/04/cve-publication-garlicrust-cve-2017-17066/ Pull ready. https://github.com/gentoo/gentoo/pull/6468
A week ago, the vulnerable 2.16.0 left the portage tree. Probably, this bug is safe to close.