A rabbitmq-server regression update has been released for Debian GNU/Linux 9 LTS introduced by the previous DLA 2710-1 update.

DLA 2710-2: rabbitmq-server regression update

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Debian LTS Advisory DLA-2710-2 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Abhijith PA
July 25, 2021   https://wiki.debian.org/LTS
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Package : rabbitmq-server
Version : 3.6.6-1+deb9u2

It was discovered that the previous upload of the package
rabbitmq-server versioned 3.6.6-1+deb9u1 introduced a regression in
function fmt_strip_tags. Big thanks to Christoph Haas for the
reporting an issue and for testing the update.

For Debian 9 stretch, this problem has been fixed in version
3.6.6-1+deb9u2.

We recommend that you upgrade your rabbitmq-server packages.

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

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