The NTLM authentication feature in curl and libcurl before 7.57.0 on 32-bit platforms allows attackers to cause a denial of service (integer overflow and resultant buffer overflow, and application crash) or possibly have unspecified other impact via vectors involving long user and password fields.
https://www.debian.org/security/2017/dsa-4051
https://security.gentoo.org/glsa/201712-04
https://curl.haxx.se/docs/adv_2017-12e7.html
https://access.redhat.com/errata/RHSA-2018:3558
http://www.securitytracker.com/id/1040608
http://www.securitytracker.com/id/1039896
http://www.securityfocus.com/bid/101998
http://security.cucumberlinux.com/security/details.php?id=161