A flaw was found in curl before version 7.51.0. The way curl handles cookies permits other threads to trigger a use-after-free leading to information disclosure.
https://www.tenable.com/security/tns-2016-21
https://security.gentoo.org/glsa/201701-47
https://bugzilla.redhat.com/show_bug.cgi?id=CVE-2016-8623
https://access.redhat.com/errata/RHSA-2018:3558
https://access.redhat.com/errata/RHSA-2018:2486