I don’t know if a news will be sent. A possibile data corruption was found on zlib 1.2.10.
Please update your zlib to 1.2.11 and make sure you restart all services that are linked to zlib (a reboot may be an easy way).
Gentoo bug:
https://bugs.gentoo.org/show_bug.cgi?id=605888
Upstream bug:
https://github.com/madler/zlib/issues/198
Upstream commit:
https://github.com/madler/zlib/commit/4c7c90768308587884fab6159d93a4695a5ab1f0</a