The http_connect function in transports/http.c in libgit2 before 0.24.6 and 0.25.x before 0.25.1 might allow man-in-the-middle attackers to spoof servers by leveraging clobbering of the error variable.
https://libgit2.github.com/security/
https://github.com/libgit2/libgit2/commit/b5c6a1b407b7f8b952bded2789593b68b1876211
https://github.com/libgit2/libgit2/commit/9a64e62f0f20c9cf9b2e1609f037060eb2d8eb22
http://www.securityfocus.com/bid/95359
http://www.openwall.com/lists/oss-security/2017/01/11/6
http://www.openwall.com/lists/oss-security/2017/01/10/5
http://lists.opensuse.org/opensuse-updates/2017-02/msg00072.html
http://lists.opensuse.org/opensuse-updates/2017-02/msg00036.html
http://lists.opensuse.org/opensuse-updates/2017-02/msg00030.html