In LemonLDAP::NG before 2.16.7 and 2.17 through 2.21 before 2.21.3, OS command injection can occur in the Safe jail. It does not Localize _ during rule evaluation. Thus, an administrator who can edit a rule evaluated by the Safe jail can execute commands on the server.
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/issues/3462
https://gitlab.ow2.org/lemonldap-ng/lemonldap-ng/-/commit/228d01945d48015f3f9ea8a8dc64d7e6a27750e9