Nope it doesn't have segwit or any malleability fix, afaik.
Albeit it was ported (from Primecoin) 0.15.99 ver of Bitcoin Core, it didn't include this feature, cause veronium said, that it's impossible without turning off old clients in the network (0.8.x).
Yes, it was ported from 0.15.99 ver of Bitcoin Core, but the last commit on github was only 12 days ago.
So maybe someone (gjhiggins ?) included the fix at some time, I don't know.
Anyway I would like to know if someone could change the
data field of Datacoin by using the transaction malleability.
Afaik, the transaction malleability could allow a malicious miner to change the
transaction ID of a transaction before it is confirmed on the bitcoin network.
Can this also be used to change the
data field of a Datacoin transaction?
I think that this thing should be very useful to know for a ledger that is a Censorship-Free Data Storage.
Thank you