A couple of clarifications, since this thread is getting heated: Home Assistant’s HIBP check uses k-anonymity — it sends only the first 5 characters of the SHA-1 prefix to the range API and matches the rest locally. Your actual password (and the full hash) never leaves the machine, so there’s no credential leak in any meaningful sense.

If you still want zero outbound traffic, the check is config-visible and you can point it at a local copy of the HIBP dump or disable it. The real takeaway: secrets in plain-text YAML are far more exposed to local risks — backups, shared configs, accidental git pushes — than to this feature. Use !secret entries and keep the secrets file out of anything you sync or commit.