Apple has today seeded the third beta of OS X 10.10.5 to developers. This comes one week after the second seed. This time we do know what’s updated and fixed. 10.10.5 adds a fix for the DYLD_PRINT_TO_FILE exploit. We also see some other bug fixes and improvements.
Developers can update to beta 3 in the Mac App Store > Updates > Software updates > OS X 10.10.5 beta 3. If you don’t have it yet you can download it for the first time from the Mac Developer Center.