A haproxy security update has been released for Debian GNU/Linux 9 LTS to address a denial of service issue.

DLA 3034-1: haproxy security update

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Debian LTS Advisory DLA-3034-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Markus Koschany
May 30, 2022   https://wiki.debian.org/LTS
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Package : haproxy
Version : 1.7.5-2+deb9u1
CVE ID : CVE-2018-20102 CVE-2018-20103 CVE-2019-18277
Debian Bug : 916308 916307

Nathan Davison discovered that HAProxy, a load balancing reverse proxy, did not
correctly reject requests or responses featuring a transfer-encoding header
missing the "chunked" value which could facilitate a HTTP request smuggling
attack. Furthermore several flaws were discovered in DNS related functions that
may trigger infinite recursion leading to a denial of service or to information
leakage due to a out-of-bounds read.

For Debian 9 stretch, these problems have been fixed in version
1.7.5-2+deb9u1.

We recommend that you upgrade your haproxy packages.

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

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