ISC has released BIND 9.20.27 and BIND 9.21.25, marking the first monthly maintenance updates under a new security release cadence due to a surge in vulnerability reports from LLM-driven code analysis. BIND 9.20.27 serves as the stable version for production systems, while 9.21.25 is a development branch for testing new features. Operators using BIND 9.20 are encouraged to update to 9.20.27, and those still on BIND 9.18 must migrate immediately as that branch is now end-of-life. The increased frequency of security updates is expected to continue through 2026, with ISC suggesting that users prioritize monthly updates to stay secure

BIND 9.20.27 and 9.21.25 Released: What DNS Operators Should Know

ISC released BIND 9.20.27 and BIND 9.21.25 today, making them the first monthly maintenance releases under ISC's new security cadence. BIND 9.20.27 is the stable update for production systems, while BIND 9.21.25 is the development branch for testing new features. The shift follows ISC's warning that LLM-driven code analysis is producing vulnerability reports at more than 10 times historic levels. If you run BIND 9.20, update to 9.20.27 now, and if you are still on BIND 9.18, migrate immediately because that branch is end of life.

BIND 9.20.27 and 9.21.25 Released: What DNS Operators Should Know @ Linux Compatible