A e2fsprogs security update has been released for Debian GNU/Linux 9 LTS to address an issue.

DLA 2290-1: e2fsprogs security update

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Debian LTS Advisory DLA-2290-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
July 26, 2020   https://wiki.debian.org/LTS
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Package : e2fsprogs
Version : 1.43.4-2+deb9u2
CVE ID : CVE-2019-5188

An issue has been found in e2fsprogs, a package that contains
ext2/ext3/ext4 file system utilities. A specially crafted ext4 directory
can cause an out-of-bounds write on the stack, resulting in code
execution. An attacker can corrupt a partition to trigger this
vulnerability.

For Debian 9 stretch, this problem has been fixed in version
1.43.4-2+deb9u2.

We recommend that you upgrade your e2fsprogs packages.

For the detailed security status of e2fsprogs please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/e2fsprogs

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