Libgit2 -- multiple vulnerabilities

The Git community reports:

A carefully constructed commit object with a very large number of parents may lead to potential out-of-bounds writes or potential denial of service.

The ProgramData configuration file is always read for compatibility with Git for Windows and Portable Git installations. The ProgramData location is not necessarily writable only by administrators, so we now ensure that the configuration file is owned by the administrator or the current user.

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