A libxstream-java security update has been released for Debian GNU/Linux 9 LTS to address a potential remote denial of service (DoS) attack.

DLA 2924-1: libxstream-java security update

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Debian LTS Advisory DLA-2924-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
February 15, 2022   https://wiki.debian.org/LTS
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Package : libxstream-java
Version : 1.4.11.1-1+deb9u5
CVE ID : CVE-2021-43859

It was discovered that there was a potential remote denial of service
(DoS) attack in XStream, a Java library used to serialize objects to
XML and back again.

An attacker could have consumed 100% of the CPU resources, but the
library now monitors and accumulates the time it takes to add
elements to collections, and throws an exception if a set threshold
is exceeded.

For Debian 9 "Stretch", this problem has been fixed in version
1.4.11.1-1+deb9u5.

We recommend that you upgrade your libxstream-java packages.

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