You should be on the security-alert mailing list of the vendor of every operating system you admin. Typically these are extremely low-volume mailing lists, and applying the security patches they recommend is frequently urgent if your machine is connected to the internet.
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- NetBSD Security mailing list subscription.
- OpenBSD All OpenBSD mailing lists, including security alerts.
- Debian: Security Announcements Security announce mailing list for Debian Linux.
- Apache Apache Week, includes security alerts.
- Microsoft How to subscribe to the (free) e-mail notification service that Microsoft uses to send information about security of Microsoft products.
- Gentoo Linux List of security announcements and information on how to sign up to security mailing list.
- Red Hat Linux Notifications and advisories. Security mailing list subscription is on this page.