From
Apple releases security update for Mac OS X:

Apple on Monday released a security update for Mac
OS X, updating several of the components and technologies in the operating system. Specifically the update affects AppKit, BlueTooth, CoreFoundation, cups, Directory Services, HIToolBox, Kerberos, loginwindow, Mail, OpenSSL, QuartzComposerScreenSaver, Security Interface, Safari, X11 and zlib.