It is possible to install a patch for 10.6. See Apple issues fix for ‘Shell Shock’ Bash vulnerability. Scroll down to the part that says:

Lastly, this update does not cover OS X 10.6 systems, so if you are still running Snow Leopard, then you will still need to install XCode version 3.2 and then download and compile the fixed version of bash manually. Once XCode is installed, then the follow the instructions to patch bash.

Caveat: I have not yet done this myself.


Jon

macOS 11.7.10, iMac Retina 5K 27-inch, late 2014, 3.5 GHz Intel Core i5, 1 TB fusion drive, 16 GB RAM, Epson SureColor P600, Photoshop CC, Lightroom CC, MS Office 365