A tar security update has been for Debian GNU/Linux 9 LTS.

DLA 2830-1: tar security update

- -------------------------------------------------------------------------
Debian LTS Advisory DLA-2830-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Adrian Bunk
November 28, 2021   https://wiki.debian.org/LTS
- -------------------------------------------------------------------------

Package : tar
Version : 1.29b-1.1+deb9u1
CVE ID : CVE-2018-20482
Debian Bug : 917377

An infinite loop when --sparse is used with file shrinkage during read
access was fixed in the GNU tar archiving utility.

For Debian 9 stretch, this problem has been fixed in version
1.29b-1.1+deb9u1.

We recommend that you upgrade your tar packages.

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

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