Please do not open a public issue for a security problem. Report it privately through GitHub instead: open the Security tab of ExeQue/lumberjack and choose Report a vulnerability.

Include what is affected, how to reproduce it and what an attacker could do with it. You can expect a first answer within a week. Once a fix is released, the advisory is published and you are credited unless you prefer not to be.

Only the latest release receives security fixes.