A libjdom2-java security update has been released for Debian GNU/Linux 9 LTS to address a denial of service security issue.

DLA 2696-1: libjdom2-java security update

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Debian LTS Advisory DLA-2696-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
June 29, 2021   https://wiki.debian.org/LTS
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Package : libjdom2-java
Version : 2.0.6-1+deb9u1
CVE ID : CVE-2021-33813

It was discovered that there was an XML External Entity (XXE)
issue in libjdom2-java, a library for reading and manipulating
XML documents. Attackers could have caused a denial of service
attack via a specially-crafted HTTP request.

For Debian 9 "Stretch", this problem has been fixed in version
2.0.6-1+deb9u1.

We recommend that you upgrade your libjdom2-java packages.

For the detailed security status of libjdom2-java please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libjdom2-java

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