A squid security update has been released for Debian GNU/Linux 10 and 11 to address multiple security issues.

DSA 5171-1: squid security update

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Debian Security Advisory DSA-5171-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
June 27, 2022   https://www.debian.org/security/faq
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Package : squid
CVE ID : CVE-2021-28116 CVE-2021-46784

Multiple security issues were discovered in the Squid proxy caching
server:

CVE-2021-28116

Amos Jeffries discovered an information leak if WCCPv2 is enabled

CVE-2021-46784

Joshua Rogers discovered that an error in parsing Gopher server
responses may result in denial of service

For the oldstable distribution (buster), these problems have been fixed
in version 4.6-1+deb10u7.

For the stable distribution (bullseye), these problems have been fixed in
version 4.13-10+deb11u1.

We recommend that you upgrade your squid packages.

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

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/