CVE-2017-17458 (http://nvd.nist.gov/nvd.cfm?cvename=CVE-2017-17458): In Mercurial before 4.4.1, it is possible that a specially malformed repository can cause Git subrepositories to run arbitrary code in the form of a .git/hooks/post-update script checked into the repository. Typical use of Mercurial prevents construction of such repositories, but they can be created programmatically.
*** This bug has been marked as a duplicate of bug 636704 ***