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 the stable distribution (bullseye), this problem has been fixed in version 5.5.13.2-1+deb11u1.
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.