Security firm Bluebox recently revealed a new Android vulnerability, and it looks like my Optimus S (HydroROM v1.1.0) at least is affected:
Some more details about the bug (8219321) and a source code patch here.
Looks like Cyanogenmod has included the fix already in some versions at least - any Opti S ROMs have this fix yet? I'm guessing LG isn't going to bother to release a new stock firmware, but you never know.