Mercurial prior to 3.7.3 allowed URLs for Git subrepos that could result in arbitrary code execution on clone. This is a further side-effect of Git CVE-2015-7545.
Created mercurial tracking bugs for this issue:
Affects: fedora-all [bug 1322268]
*** This bug has been marked as a duplicate of bug 1319768 ***
mercurial-3.5.2-1.fc22 has been pushed to the Fedora 22 stable repository. If problems still persist, please make note of it in this bug report.
mercurial-3.5.2-1.fc23 has been pushed to the Fedora 23 stable repository. If problems still persist, please make note of it in this bug report.