A zlib security update has been released for Debian GNU/Linux 10 and 11 to address a denial of service issue.

DSA 5111-1: zlib security update

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Debian Security Advisory DSA-5111-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
April 01, 2022   https://www.debian.org/security/faq
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Package : zlib
CVE ID : CVE-2018-25032
Debian Bug : 1008265

Danilo Ramos discovered that incorrect memory handling in zlib's deflate
handling could result in denial of service or potentially the execution
of arbitrary code if specially crafted input is processed.

For the oldstable distribution (buster), this problem has been fixed
in version 1:1.2.11.dfsg-1+deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 1:1.2.11.dfsg-2+deb11u1.

We recommend that you upgrade your zlib packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/