The Apache HTTP Web Server is the most widely deployed Web server on the Internet today, which means that vulnerabilities in the open source server can have a devastating impact. That also makes security updates like the new 2.2.15 release critical, since it addresses several security vulnerabilities in Apache's flagship HTTP Web server.

Mozilla is out this week with Firefox 3.5.9 and 3.0.19 updates, fixing multiple security vulnerabilities in the open source Web browser's two branches, while announcing that the older of the two branches is being phased out.

Updated versions of the open source database PostgreSQL fix security vulnerabilities in the Perl and Tcl procedural languages for stored procedures

"The newest official XULRunner has been released. XULRunner 1.9.0.4 matches the Firefox 3.0.4 release. For XULRunner developers, most of the changes in 1.9.0.4 are related to security fixes..."

"Lately, I’ve caught the IceApe bug (IceApe is a rebranded/renamed Mozilla Seamonkey), and I’d like to share my enthusiasm about it..."

Palamida, the San Francisco company that helps companies to audit their use of open source software, has released a list of what it calls "the top five most overlooked open source vulnerabilities." To this list, Palamida has added an additional five vulnerabilities exclusively for Linux.com.

The Camino Project developers have released version 2.0.3 of their open source web browser for Mac, addressing several critical security vulnerabilities and improving overall stability

As part of its Chromium Security Reward programme, Google paid out $1,000 for notification of one of the reported vulnerabilities

Version 2.5.6 of the cross-platform open source instant messaging client Pidgin, formerly named Gaim, fixes several security vulnerabilities.