Security announce mailing list for Debian Linux.

How to subscribe to the (free) e-mail notification service that Microsoft uses to send information about security of Microsoft products.

Includes subscription instructions for the Sun security-alert mailing list. Subscribe to this list to be alerted when security patches are released. Very low volume.

List of security announcements and information on how to sign up to security mailing list.

All OpenBSD mailing lists, including security alerts.

All SuSE Linux mailing lists, including security alerts.

Oracle security mailing list. Requires registration.

Notifications and advisories. Security mailing list subscription is on this page.

Apache Week, includes security alerts.

Security alert notification service.