A haproxy security update has been released for Debian GNU/Linux 10 to address a denial-of-service or potential arbitrary code execution issue.

DSA 4649-1: haproxy security update

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Debian Security Advisory DSA-4649-1 security@debian.org
  https://www.debian.org/security/ Sebastien Delafond
April 02, 2020   https://www.debian.org/security/faq
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Package : haproxy
CVE ID : CVE-2020-11100

Felix Wilhelm of Google Project Zero discovered that HAProxy, a TCP/HTTP
reverse proxy, did not properly handle HTTP/2 headers. This would allow
an attacker to write arbitrary bytes around a certain location on the
heap, resulting in denial-of-service or potential arbitrary code
execution.

For the stable distribution (buster), this problem has been fixed in
version 1.8.19-1+deb10u2.

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 Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/