A puma security update has been released for Debian GNU/Linux 11 to address multiple security vulnerabilities.

DSA 5146-1: puma security update

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Debian Security Advisory DSA-5146-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 24, 2022   https://www.debian.org/security/faq
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Package : puma
CVE ID : CVE-2021-41136 CVE-2022-23634 CVE-2022-24790

Multiple security vulnerabilities were discovered in Puma, a HTTP server
for Ruby/Rack applications, which could result in HTTP request smuggling
or information disclosure.

For the stable distribution (bullseye), this problem has been fixed in
version 4.3.8-1+deb11u2.

We recommend that you upgrade your puma packages.

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

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/