The ConnectionExists function in lib/url.c in libcurl before 7.47.0 does not properly re-use NTLM-authenticated proxy connections, which might allow remote attackers to authenticate as other users via a request, a similar issue to CVE-2014-0015.
http://lists.apple.com/archives/security-announce/2016/Sep/msg00006.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/176546.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177342.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-February/177383.html
http://lists.fedoraproject.org/pipermail/package-announce/2016-January/176413.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00031.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00044.html
http://lists.opensuse.org/opensuse-updates/2016-02/msg00047.html
http://packetstormsecurity.com/files/135695/Slackware-Security-Advisory-curl-Updates.html
https://security.gentoo.org/glsa/201701-47
https://support.apple.com/HT207170
http://www.debian.org/security/2016/dsa-3455
http://www.oracle.com/technetwork/security-advisory/cpuoct2018-4428296.html