A libjdom1-java security update has been released for Debian GNU/Linux 9 LTS to address an entity-expansion issue in libjdom1-java.

DLA 2712-1: libjdom1-java security update

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Debian LTS Advisory DLA-2712-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
July 20, 2021   https://wiki.debian.org/LTS
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Package : libjdom1-java
Version : 1.1.3-1+deb9u1
CVE ID : CVE-2021-33813
Debian Bug : #990672

It was discovered that there was a potential an entity-expansion
issue in libjdom1-java, a lightweight and fast library for using
XML. Attackers could have caused a denial of service via a
specially-crafted HTTP request.

For Debian 9 "Stretch", this problem has been fixed in version
1.1.3-1+deb9u1.

We recommend that you upgrade your libjdom1-java packages.

For the detailed security status of libjdom1-java please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/libjdom1-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