I can't find any information on the following questions: Are all past versions of OS X / Apple Mail affected? For what OS X Version does Apple provide a securi

I can't find any information on the following questions: Are all past versions of OS X / Apple Mail affected? For what OS X Version does Apple provide a security update regarding this issue? Has anyone found a fix that prevents auto-uncompression (such as a "defaults write com.apple.mail xyz False" command)? Due to several reasons, I am also on an older Version of OS X and this issue makes me a bit nervous.