New BIND 9 releases: 9.18.47, 9.20.21, 9.21.20

[Suzanne Goldlust]

Our March 2026 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.

In addition to bug fixes and feature improvements, these releases also contain fixes for security vulnerabilities.  More information can be found in the following Security Advisories:

    https://kb.isc.org/docs/cve-2026-1519
    https://kb.isc.org/docs/cve-2026-3104
    https://kb.isc.org/docs/cve-2026-3119
    https://kb.isc.org/docs/cve-2026-3591

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:

    - 9.18.47  - https://downloads.isc.org/isc/bind9/9.18.47/
    - 9.20.21  - https://downloads.isc.org/isc/bind9/9.20.21/

  - Experimental development branch:

    - 9.21.20  - https://downloads.isc.org/isc/bind9/9.21.20/

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).

Thank you for using ISC’s software.