Release Notes


BIND 9.19 is an unstable development release of BIND. This document summarizes new features and functional changes that have been introduced on this branch. With each development release leading up to the stable BIND 9.20 release, this document will be updated with additional features added and bugs fixed. Please see the CHANGES file for a more detailed list of changes and bug fixes.

Supported Platforms

See the Supported Platforms section in the Resource Requirements chapter.


The latest versions of BIND 9 software can always be found at There you will find additional information about each release, and source code.

Notes for BIND 9.19.2

Feature Changes

  • New dnssec-policy configuration checks have been added to detect unusual policies, such as missing KSK and/or ZSK and too-short key lifetimes and re-sign periods. [GL #1611]

Bug Fixes

  • The fetches-per-server quota is designed to adjust itself downward automatically when an authoritative server times out too frequently. Due to a coding error, that adjustment was applied incorrectly, so that the quota for a congested server was always set to 1. This has been fixed. [GL #3327]

  • DNSSEC-signed catalog zones were not being processed correctly. This has been fixed. [GL #3380]

  • Key files were updated every time the dnssec-policy key manager ran, whether the metadata had changed or not. named now checks whether changes were applied before writing out the key files. [GL #3302]

Notes for BIND 9.19.1

Security Fixes

  • Previously, TLS socket objects could be destroyed prematurely, which triggered assertion failures in named instances serving DNS-over-HTTPS (DoH) clients. This has been fixed.

    ISC would like to thank Thomas Amgarten from arcade solutions ag for bringing this vulnerability to our attention. (CVE-2022-1183) [GL #3216]

New Features

  • Catalog Zones schema version 2, as described in the “DNS Catalog Zones” IETF draft version 5 document, is now supported by named. All of the previously supported BIND-specific catalog zone custom properties (primaries, allow-query, and allow-transfer), as well as the new Change of Ownership (coo) property, are now implemented. Schema version 1 is still supported, with some additional validation rules applied from schema version 2: for example, the version property is mandatory, and a member zone PTR RRset must not contain more than one record. In the event of a validation error, a corresponding error message is logged to help with diagnosing the problem. [GL #3221] [GL #3222] [GL #3223] [GL #3224] [GL #3225]

  • Support DNS Extended Errors (RFC 8914) Stale Answer and Stale NXDOMAIN Answer when stale answers are returned from cache. [GL #2267]

  • The Object Identifier (OID) embedded at the start of a PRIVATEOID public key in a KEY, DNSKEY, CDNSKEY, or RKEY resource records is now checked to ensure that it is valid when reading from zone files or receiving data on the wire. The Object Identifier is now printed when the dig +rrcomments option is used. Similarly, the name embedded at the start of a PRIVATEDNS public key is also checked for validity. [GL #3234]

  • The Object Identifier (OID) embedded at the start of a PRIVATEOID signature in a SIG, or RRSIG resource records is now checked to ensure that it is valid when reading from zone files or receiving data on the wire. Similarly, the name embedded at the start of a PRIVATEDNS public key is also checked for validity. [GL #3296]

Bug Fixes

  • Previously, CDS and CDNSKEY DELETE records were removed from the zone when configured with the auto-dnssec maintain; option. This has been fixed. [GL #2931]

Notes for BIND 9.19.0

Known Issues

  • According to RFC 8310, Section 8.1, the Subject field MUST NOT be inspected when verifying a remote certificate while establishing a DNS-over-TLS connection. Only subjectAltName must be checked instead. Unfortunately, some quite old versions of cryptographic libraries might lack the ability to ignore the Subject field. This should have minimal production-use consequences, as most of the production-ready certificates issued by certificate authorities will have subjectAltName set. In such cases, the Subject field is ignored. Only old platforms are affected by this, e.g. those supplied with OpenSSL versions older than 1.1.1. [GL #3163]

New Features

  • Add support for remote TLS certificate verification, both to named and dig, making it possible to implement Strict and Mutual TLS authentication, as described in RFC 9103, Section 9.3. [GL #3163]

  • dnssec-verify and dnssec-signzone now accept a -J option to specify a journal file to read when loading the zone to be verified or signed. [GL #2486]

Removed Features

  • The keep-order-response option has been declared obsolete and the functionality has been removed. named expects DNS clients to be fully compliant with RFC 7766. [GL #3140]

Feature Changes

  • Run RPZ updates on the specialized “offload” threads to reduce the amount of time they block query processing on the main networking threads. This should increase the responsiveness of named when RPZ updates are being applied after an RPZ zone has been successfully transferred. [GL #3190]


BIND 9 is open source software licensed under the terms of the Mozilla Public License, version 2.0 (see the COPYING file for the full text).

Those wishing to discuss license compliance may contact ISC at

End of Life

BIND 9.19 is an unstable development branch. When its development is complete, it will be renamed to BIND 9.20, which will be a stable branch. The end-of-life date for BIND 9.20 has not yet been determined. For those needing long-term stability, the current Extended Support Version (ESV) is BIND 9.16, which will be supported until at least December 2023. See for details of ISC’s software support policy.

Thank You

Thank you to everyone who assisted us in making this release possible.