Release Notes: A new Jemalloc memory allocator. A new Virtual Host FDT feature 'Shared file descriptors'. A new error handler for system calls. Many Scheduler optimizations. A new debugging mechanism through Linux Trace Toolkit (LTTng). A new experimental Proxy Reverse. The SSL plugin now supports for PolarSSL v1.3. The license has moved from the GPLv2 to the LGPLv2.1. There are many others.
Release Notes: This is a major release with performance improvements, new support for the musl C library, and generic bugfixes.
Release Notes: This release comes with important security fixes. There were three fixes for the basic authentication plugin and a fix for an issue with HTTP range headers that could cause a DoS.
Release Notes: This release fix a bug in the HTTP headers parser which could lead to a DoS.
Release Notes: This release comes with huge improvements in the CGI and FastCGI interfaces. It integrates a new SSL layer based on PolarSSL, core/speed improvements in the core scheduler, and adds support for Linux TCP_FASTOPEN.