Sending out a notice on the blog, since the original post was not part of the blog section:

Dojo 0.4.3 is now available to download. This is a security release. Dojo 0.4.1 and 0.4.2 users are strongly recommended to upgrade as soon as possible. 0.4.1 and 0.4.2 have a flaw in two files that could allow cross site scripting (XSS) attacks against your site if you do not upgrade.

Dojo 0.4.3 also has support for doing layered custom builds.

More information can be found at 0.4.3 and Updated 0.4.1/0.4.2 Builds.