curl and libcurl before 7.50.1 do not prevent TLS session resumption when the client certificate has changed, which allows remote attackers to bypass intended restrictions by resuming a session.
http://lists.opensuse.org/opensuse-updates/2016-09/msg00011.html
http://lists.opensuse.org/opensuse-updates/2016-09/msg00094.html
http://rhn.redhat.com/errata/RHSA-2016-2575.html
http://rhn.redhat.com/errata/RHSA-2016-2957.html
https://access.redhat.com/errata/RHSA-2018:3558
https://security.gentoo.org/glsa/201701-47
https://www.tenable.com/security/tns-2016-18
http://www.debian.org/security/2016/dsa-3638
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html
http://www.securitytracker.com/id/1036538