A fluidsynth security update has been released for Debian GNU/Linux 9 LTS to address a potential arbitrary code execution or denial of service.

DLA 2697-1: fluidsynth security update

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Debian LTS Advisory DLA-2697-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
June 29, 2021   https://wiki.debian.org/LTS
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Package : fluidsynth
Version : 1.1.6-4+deb9u1
CVE ID : CVE-2021-28421

A vulnerbility has been found in fluidsynth, a real-time MIDI software
synthesizer.
Using a special crafted soundfont2 file, a use after free vulnerability
might result in arbitrary code execution or a denial of service (DoS).

For Debian 9 stretch, this problem has been fixed in version
1.1.6-4+deb9u1.

We recommend that you upgrade your fluidsynth packages.

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

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