New BIND 9 releases: 9.18.43, 9.20.17, 9.21.16

[Victoria Risk]

BIND users,

Our December 2025 maintenance releases of BIND 9 are available and can be downloaded from the links below.  Packages and container images provided by ISC will be updated later today.

A link to each newly-released version follows.  Each release directory includes a complete source tarball, cryptographic signature, and release notes.  The release notes provide a summary of significant changes, and should be reviewed before upgrading.

  - Current supported stable branches:

    - 9.18.43  - https://downloads.isc.org/isc/bind9/9.18.43/
    - 9.20.17  - https://downloads.isc.org/isc/bind9/9.20.17/

  - Experimental development branch:

    - 9.21.16  - https://downloads.isc.org/isc/bind9/9.21.16/

For more information and other release formats, consult the ISC software download page: https://www.isc.org/download/

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As a reminder, BIND’s supported platforms are listed in the ARM (https://bind9.readthedocs.io/en/stable/chapter2.html#supported-platforms) and in this knowledgebase article (https://kb.isc.org/docs/supported-platforms).