It was discovered that the CompareTool of iText, a Java PDF library which uses the external ghostscript software to compare PDFs at a pixel level, allowed command injection when parsing a specially crafted filename.
For Debian 10 buster, this problem has been fixed in version 5.5.13-1+deb10u1.
We recommend that you upgrade your libitext5-java packages.
For the detailed security status of libitext5-java please refer to its security tracker page at: https://security-tracker.debian.org/tracker/libitext5-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