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

DSA 5088-1: varnish security update

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Debian Security Advisory DSA-5088-1 security@debian.org
  https://www.debian.org/security/ Florian Weimer
March 03, 2022   https://www.debian.org/security/faq
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Package : varnish
CVE ID : CVE-2021-36740 CVE-2022-23959
Debian Bug : 991040 1004433

Brief introduction

CVE-2021-36740

Martin Blix Grydeland discovered that Varnish is vulnerable to
request smuggling attacks if the HTTP/2 protocol is enabled.

CVE-2022-23959

James Kettle discovered a request smuggling attack against the
HTTP/1 protocol implementation in Varnish.

For the oldstable distribution (buster), these problems have been fixed
in version 6.1.1-1+deb10u3.

For the stable distribution (bullseye), these problems have been fixed in
version 6.5.1-1+deb11u2.

We recommend that you upgrade your varnish packages.

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

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/