.. 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 9.16.42
----------------------

Security Fixes
~~~~~~~~~~~~~~

- The overmem cleaning process has been improved, to prevent the cache
  from significantly exceeding the configured ``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`

Bug Fixes
~~~~~~~~~

- Previously, it was possible for a delegation from cache to be returned
  to the client after the ``stale-answer-client-timeout`` duration.
  This has been fixed. :gl:`#3950`

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.