Nginx recently announced the immediate availability of Nginx 1.5.12 mainline and Nginx 1.4.7 to address a security issue with SPDY protocol (CVE-2014-0133). Both packages have been updated on deb.erianna.com to address this security issue.
This is strictly a security update for Nginx. No additional changes were made.
If you're already using deb.erianna.com, this package can be installed by running the following commands:
apt-get update apt-get install nginx-mainline # Nginx 1.5.12 # OR # apt-get install nginx # Nginx 1.4.7
If you're not using deb.erianna.com, you can read about how to setup the repository here.