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.
{
"cwe_ids": [
"CWE-78"
],
"github_reviewed_at": "2024-05-01T17:02:42Z",
"severity": "CRITICAL",
"nvd_published_at": "2017-12-07T18:29:00Z",
"github_reviewed": true
}