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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.18.16
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- The overmem cleaning process has been improved, to prevent the cache from
+  significantly exceeding the configured :any:`max-cache-size` limit.
+  (CVE-2023-2828)
+
+  ISC would like to thank Shoham Danino from Reichman University, Anat
+  Bremler-Barr from Tel-Aviv University, Yehuda Afek from Tel-Aviv University,
+  and Yuval Shavitt from Tel-Aviv University for bringing this vulnerability to
+  our attention.  :gl:`#4055`
+
+- A query that prioritizes stale data over lookup triggers a fetch to refresh
+  the stale data in cache. If the fetch is aborted for exceeding the recursion
+  quota, it was possible for :iscman:`named` to enter an infinite callback
+  loop and crash due to stack overflow. This has been fixed. (CVE-2023-2911)
+  :gl:`#4089`
+
+New Features
+~~~~~~~~~~~~
+
+- The system test suite can now be executed with pytest (along with
+  pytest-xdist for parallel execution). :gl:`#3978`
+
+Removed Features
+~~~~~~~~~~~~~~~~
+
+- TKEY mode 2 (Diffie-Hellman Exchanged Keying) is now deprecated, and
+  will be removed in a future release. A warning will be logged when
+  the :any:`tkey-dhkey` option is used in ``named.conf``. :gl:`#3905`
+
+Bug Fixes
+~~~~~~~~~
+
+- BIND could get stuck on reconfiguration when a :any:`listen-on`
+  statement for HTTP is removed from the configuration. That has been
+  fixed. :gl:`#4071`
+
+- Previously, it was possible for a delegation from cache to be returned
+  to the client after the :any:`stale-answer-client-timeout` duration.
+  This has been fixed. :gl:`#3950`
+
+- BIND could allocate too big buffers when sending data via
+  stream-based DNS transports, leading to increased memory usage.
+  This has been fixed. :gl:`#4038`
+
+- When the :any:`stale-answer-enable` option was enabled and the
+  :any:`stale-answer-client-timeout` option was enabled and larger than
+  0, :iscman:`named` previously allocated two slots from the
+  :any:`clients-per-query` limit for each client and failed to gradually
+  auto-tune its value, as configured. This has been fixed. :gl:`#4074`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.