A flac security update has been released for Debian GNU/Linux 9 LTS to address two vulnerabilities were fixed in flac.

DLA 2514-1: flac security update

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Debian LTS Advisory DLA-2514-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
January 04, 2021   https://wiki.debian.org/LTS
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Package : flac
Version : 1.3.2-2+deb9u1
CVE ID : CVE-2017-6888 CVE-2020-0499
Debian Bug : 897015 977764

Two vulnerabilities were fixed in flac, the library for the
Free Lossless Audio Codec.

CVE-2017-6888

Memory leak via a specially crafted FLAC file

CVE-2020-0499

Out of bounds read due to a heap buffer overflow

For Debian 9 stretch, these problems have been fixed in version
1.3.2-2+deb9u1.

We recommend that you upgrade your flac packages.

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

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