Internet Bug Bounty: Mercurial git subrepo lead to arbritary command injection

Hi IBB, I'd like to submit a issue exist in Mercurial. 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 in to the repository in Mercurial 4.4 and earlier. Typical use of Mercurial preven...