The issue described in the the latest publication of Stagefright issues (link) has been patched in source for CM 10.1 -> 12.1. Nightlies for 12.1 beginning tonight (~2hours) will include this fix, in addition to all the other exploits that came as a result of Stagefright and DefCon/Blackhat.
On the topic of 10.1 & 10.2, while these have been patched for this particular series of issues, we do not intend to issue a new release for these branches – the patches are there more so to protect derivative ROMs that use our source as base code.
We will be releasing another stable version of 11.0 and 12.0 (as well as a stable 12.1 release) with all of these fixes (and more) by the end of this month. More on that in a separate post.