Nginx 1.4.7 has been released on March 18th 2014, fixing a potential heap memory buffer overflow when using SPDY, and also the fastcgi_next_upstream
directive. More info in the changelog.
As a consequence, Dotdeb’s packages of Nginx 1.4.7 are now available for both Debian 7.0 “Wheezy” and Debian 6.0 “Squeeze” (amd64/i386).
As usual, if you want to know which module has been included in each Nginx flavor, you just have to look at this document.