A waitress security update has been released for Debian GNU/Linux 10 and 11 to address a HTTP request smuggling issue.

DSA 5138-1: waitress security update

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Debian Security Advisory DSA-5138-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
May 17, 2022   https://www.debian.org/security/faq
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Package : waitress
CVE ID : CVE-2022-24761
Debian Bug : 1008013

It was discovered that the Waitress WSGI server was susceptible to
HTTP request smuggling in some scenarios when used behind a proxy.

For the oldstable distribution (buster), this problem has been fixed
in version 1.2.0~b2-2+deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 1.4.4-1.1+deb11u1.

We recommend that you upgrade your waitress packages.

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

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/