Should I upgrade to v0.12 ?

[lfam (lf)]

You should upgrade regardless — version 0.12.14 was a security update:

Security update - Syncthing v0.12.14

Continuing the discussion from Upcoming security release of Go: I’ve just pushed and built Syncthing v0.12.14. This build is built with Go 1.5.3, except for the Windows which is built using Go 1.6beta2. Go 1.5.3 / 1.6beta2 fixes the security issue described here, but the relevant part is: Specifically, incorrect results in one part of the RSA Chinese Remainder computation can cause the result to be incorrect in such a way that it leaks one of the primes. While RSA blinding should prevent an a…