A puma security update has been released for Debian GNU/Linux 9 LTS to address several security vulnerabilities.

DLA 3023-1: puma security update

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Debian LTS Advisory DLA-3023-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
May 26, 2022   https://wiki.debian.org/LTS
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Package : puma
Version : 3.6.0-1+deb9u2
CVE ID : CVE-2019-16770 CVE-2020-5247 CVE-2022-23634
Debian Bug : 946312 952766 1005391

Several security vulnerabilities have been discovered in puma, a web server for
Ruby/Rack applications. These flaws may lead to information leakage due to not
always closing response bodies, allowing untrusted input in a response header
(HTTP Response Splitting) and thus potentially facilitating several other
attacks like cross-site scripting. A poorly-behaved client could also use
keepalive requests to monopolize Puma's reactor and create a denial of service
attack.

For Debian 9 stretch, these problems have been fixed in version
3.6.0-1+deb9u2.

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