This document summarizes changes since the last production release on
   the BIND 9.10 branch. Please see the CHANGES file for a further list of
   bug fixes and other changes.


   The latest versions of BIND 9 software can always be found at There you will find additional
   information about each release, source code, and pre-compiled versions
   for Microsoft Windows operating systems.

New DNSSEC Root Key

   ICANN is in the process of introducing a new Key Signing Key (KSK) for
   the global root zone. BIND has multiple methods for managing DNSSEC
   trust anchors, with somewhat different behaviors. If the root key is
   configured using the managed-keys statement, or if the pre-configured
   root key is enabled by using dnssec-validation auto, then BIND can keep
   keys up to date automatically. Servers configured in this way will roll
   seamlessly to the new key when it is published in the root zone.
   However, keys configured using the trusted-keys statement are not
   automatically maintained. If your server is performing DNSSEC
   validation and is configured using trusted-keys, you are advised to
   change your configuration before the root zone begins signing with the
   new KSK. This is currently scheduled for October 11, 2017.

   This release includes an updated version of the bind.keys file
   containing the new root key. This file can also be downloaded from .

Security Fixes

     * rndc "" could trigger an assertion failure in named. This flaw is
       disclosed in (CVE-2017-3138). [RT #44924]
     * Some chaining (i.e., type CNAME or DNAME) responses to upstream
       queries could trigger assertion failures. This flaw is disclosed in
       CVE-2017-3137. [RT #44734]
     * dns64 with break-dnssec yes; can result in an assertion failure.
       This flaw is disclosed in CVE-2017-3136. [RT #44653]
     * If a server is configured with a response policy zone (RPZ) that
       rewrites an answer with local data, and is also configured for
       DNS64 address mapping, a NULL pointer can be read triggering a
       server crash. This flaw is disclosed in CVE-2017-3135. [RT #44434]
     * named could mishandle authority sections with missing RRSIGs,
       triggering an assertion failure. This flaw is disclosed in
       CVE-2016-9444. [RT #43632]
     * named mishandled some responses where covering RRSIG records were
       returned without the requested data, resulting in an assertion
       failure. This flaw is disclosed in CVE-2016-9147. [RT #43548]
     * named incorrectly tried to cache TKEY records which could trigger
       an assertion failure when there was a class mismatch. This flaw is
       disclosed in CVE-2016-9131. [RT #43522]
     * It was possible to trigger assertions when processing responses
       containing answers of type DNAME. This flaw is disclosed in
       CVE-2016-8864. [RT #43465]
     * Added the ability to specify the maximum number of records
       permitted in a zone (max-records #;). This provides a mechanism to
       block overly large zone transfers, which is a potential risk with
       slave zones from other parties, as described in CVE-2016-6170. [RT
     * It was possible to trigger an assertion when rendering a message
       using a specially crafted request. This flaw is disclosed in
       CVE-2016-2776. [RT #43139]
     * Calling getrrsetbyname() with a non absolute name could trigger an
       infinite recursion bug in lwresd or named with lwres configured if,
       when combined with a search list entry from resolv.conf, the
       resulting name is too long. This flaw is disclosed in
       CVE-2016-2775. [RT #42694]

New Features

     * named now provides feedback to the owners of zones which have trust
       anchors configured (trusted-keys, managed-keys, dnssec-validation
       auto; and dnssec-lookaside auto;) by sending a daily query which
       encodes the keyids of the configured trust anchors for the zone.
       This is controlled by trust-anchor-telemetry and defaults to yes.
     * A new tcp-only option has been added to server clauses, to indicate
       that UDP should not be used when sending queries to a specified IP
       address or prefix.

Feature Changes

     * The ISC DNSSEC Lookaside Validation (DLV) service is scheduled to
       be disabled in 2017. A warning is now logged when named is
       configured to use this service, either explicitly or via
       dnssec-lookaside auto;. [RT #42207]
     * If an ACL is specified with an address prefix in which the prefix
       length is longer than the address portion (for example,, named will now log a warning. In future releases this
       will be a fatal configuration error. [RT #43367]

Bug Fixes

     * A synthesized CNAME record appearing in a response before the
       associated DNAME could be cached, when it should not have been.
       This was a regression introduced while addressing CVE-2016-8864.
       [RT #44318]
     * named could deadlock if multiple changes to NSEC/NSEC3 parameters
       for the same zone were being processed at the same time. [RT
     * named could trigger an assertion when sending NOTIFY messages. [RT
     * Fixed a crash when calling rndc stats on some Windows builds: some
       Visual Studio compilers generate code that crashes when the "%z"
       printf() format specifier is used. [RT #42380]
     * Windows installs were failing due to triggering UAC without the
       installation binary being signed.
     * A change in the internal binary representation of the RBT database
       node structure enabled a race condition to occur (especially when
       BIND was built with certain compilers or optimizer settings),
       leading to inconsistent database state which caused random
       assertion failures. [RT #42380]
     * Referencing a nonexistent zone in a response-policy statement could
       cause an assertion failure during configuration. [RT #43787]
     * rndc addzone could cause a crash when attempting to add a zone with
       a type other than master or slave. Such zones are now rejected. [RT
     * named could hang when encountering log file names with large
       apparent gaps in version number (for example, when files exist
       called "logfile.0", "logfile.1", and "logfile.1482954169"). This is
       now handled correctly. [RT #38688]
     * If a zone was updated while named was processing a query for
       nonexistent data, it could return out-of-sync NSEC3 records causing
       potential DNSSEC validation failure. [RT #43247]
     * named could crash when loading a zone which had RRISG records whose
       expiry fields were far enough apart to cause an integer overflow
       when comparing them. [RT #40571]
     * The arpaname and named-rrchecker commands were not installed into
       the correct prefix/bin directory. [RT #42910]
     * When receiving a response from an authoritative server with a TTL
       value of zero, named> will now only use that response once, to
       answer the currently active clients that were waiting for it.
       Previously, such response could be cached and reused for up to one
       second. [RT #42142]
     * named-checkconf now checks the rate-limit clause for correctness.
       [RT #42970]
     * Corrected a bug in the rndc control channel that could allow a read
       past the end of a buffer, crashing named. Thanks to Lian Yihan for
       reporting this error.


     * The built-in root hints have been updated to include IPv6 addresses
       for B.ROOT-SERVERS.NET (2001:500:84::b), E.ROOT-SERVERS.NET
       (2001:500:a8::e) and G.ROOT-SERVERS.NET (2001:500:12::d0d).

End of Life

   The end of life for BIND 9.10 is yet to be determined but will not be
   before BIND 9.12.0 has been released for 6 months.

Thank You

   Thank you to everyone who assisted us in making this release possible.
   If you would like to contribute to ISC to assist us in continuing to
   make quality open source software, please visit our donations page at
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