MongoDB 2.6.9 is out and is ready for production deployment. This release contains only fixes since 2.6.8, and is a recommended upgrade for all 2.6 users.
Fixed in this release:
SERVER-17441 mongos crash right after "not master" error
SERVER-17224 Aggregation pipeline with 64MB document can terminate server
SERVER-17252 Upgrade PCRE Version from 8.30 to Latest
SERVER-14992 Query for Windows 7 File Allocation Fix, and other hotfixes
As always, please let us know of any issues.
-- The MongoDB Team