Security mailing lists that deal with Debian Linux security issues, specifically the debian-security-announce and debian-security lists.

Mailing lists pertaining to FreeBSD. freebsd-security and freebsd-security-notifications are sources of official FreeBSD specific notifications.

Forum on risks to the public in computers and related systems.

Mailing list concerning DCS and SCADA Security

Macintosh security mailing list for advisories, patches, and alerts.