A libsndfile security update has been released for Debian GNU/Linux 9 to address several issues.

DLA 2418-1: libsndfile security update

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Debian LTS Advisory DLA-2418-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
October 29, 2020   https://wiki.debian.org/LTS
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Package : libsndfile
Version : 1.0.27-3+deb9u1
CVE ID : CVE-2017-6892 CVE-2017-14245 CVE-2017-14246
CVE-2017-14634 CVE-2018-19661 CVE-2018-19662
CVE-2018-19758 CVE-2019-3832

Several issues have been found in libsndfile, a library for
reading/writing audio files.
All issues are basically divide by zero errors, heap read overflows or
other buffer overlow errors.

For Debian 9 stretch, these problems have been fixed in version
1.0.27-3+deb9u1.

We recommend that you upgrade your libsndfile packages.

For the detailed security status of libsndfile please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libsndfile

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://wiki.debian.org/LTS