Only the latest release gets security fixes. Please check that the problem still happens there before reporting it.
Don't open a public issue. Report it privately through «Report a vulnerability» on the Security tab, or by email to nicolasamorosi@gmail.com.
Include the version, the operating system, the steps to reproduce it and, if a file triggers it (a presentation, a video, a Bible module), that file or how to build one. You'll get an answer within a week; once there is a fix, it ships in a release and the advisory is published with credit to you, unless you'd rather stay anonymous.
Himnova Live runs offline and opens files the operator chooses, so the areas where a report matters
most are the ones that read those files (presentations, media, imported Bibles), the worship://
protocol that serves them to the windows, and the IPC bridge between the windows and the main
process.