A libsndfile security update has been released for Debian GNU/Linux 9 LTS a heap buffer overflow.

DLA 2722-1: libsndfile security update

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Debian LTS Advisory DLA-2722-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
July 30, 2021   https://wiki.debian.org/LTS
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Package : libsndfile
Version : 1.0.27-3+deb9u2
CVE ID : CVE-2021-3246

An issue has been found in libsndfile, a library for reading/writing audio
files. A crafted WAV file can trigger a heap buffer overflow and might
allow exectution of arbitrary code.

For Debian 9 stretch, this problem has been fixed in version
1.0.27-3+deb9u2.

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