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

Bugtraq mailing list archives of UNIX, NT, Win95, Novell, and Mac, bugs and exploits.

Microsoft techNet Security - Product Security Notification. Instructions on how to join the mailing list for Product Security bulletins notification.

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

Website run by Fyodor of the NMAP project, a collection of security lists.

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

Focuses on Linux and Redhat related security information specifically the Linux-security and Redhat-watch-list lists.

Privately-run medium traffic list that caters to distribution of information security news articles.

News, background and updates on these international security standards.

The INFOCON mailing list is devoted to the discussion of cyberthreats and all aspects of information operations, including offensive and defensive information warfare, information assurance, psychological operations, electronic warfare, ....