The RSA and DSA decryption code in Nettle makes it easier for attackers to discover private keys via a cache side channel attack.
rhn.redhat.com/errata/RHSA-2016-2582.html
www.openwall.com/lists/oss-security/2016/07/29/7
www.ubuntu.com/usn/USN-3193-1
bugzilla.redhat.com/show_bug.cgi?id=1362016
eprint.iacr.org/2016/596.pdf
git.lysator.liu.se/nettle/nettle/commit/3fe1d6549765ecfb24f0b80b2ed086fdc818bff3
security.gentoo.org/glsa/201706-21
www.oracle.com/security-alerts/cpuapr2020.html