A hiredis security update has been released for Debian GNU/Linux 9 LTS to address an integer-overflow vulnerability.

DLA 2783-1: hiredis security update

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Debian LTS Advisory DLA-2783-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
October 12, 2021   https://wiki.debian.org/LTS
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Package : hiredis
Version : 0.13.3-1+deb9u1
CVE ID : CVE-2021-32765

It was discovered that there was an integer-overflow vulnerability
in hiredis, a C client library for communicating with Redis databases.
This occurred within the handling and parsing of 'multi-bulk' replies.

For Debian 9 "Stretch", this problem has been fixed in version
0.13.3-1+deb9u1.

We recommend that you upgrade your hiredis packages.

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

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