A twisted security update has been released for Debian GNU/Linux 9 LTS to address an issue that could lead to HTTP request smuggling.

DLA 2991-1: twisted security update

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Debian LTS Advisory DLA-2991-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Stefano Rivera
May 03, 2022   https://wiki.debian.org/LTS
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Package : twisted
Version : 16.6.0-2+deb9u3
CVE ID : CVE-2022-24801
Debian Bug : 1009030

The Twisted Web HTTP 1.1 server, located in the twisted.web.http module, parsed
several HTTP request constructs more leniently than permitted by RFC 7230. This
non-conformant parsing can lead to desync if requests pass through multiple
HTTP parsers, potentially resulting in HTTP request smuggling.

For Debian 9 stretch, this problem has been fixed in version
16.6.0-2+deb9u3.

We recommend that you upgrade your twisted packages.

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

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