Thanks for letting us know. There’s already an open issue for upgrading here: https://github.com/druid-io/druid/issues/3426
In the meantime, Kafka compatibility supports later versions of brokers working with earlier versions of consumers (but not the other way around). In other words, you should be able to use the Kafka indexing service (which uses an 0.9 producer) with 0.10.x brokers which will include the patch for the memory leak.
(‘The other way around’, i.e. newer consumers not working with older brokers, is the reason why we tend to be slow in upgrading the Kafka consumer, as it would force everyone to upgrade their brokers which may be non-trivial for some users/organizations).