There are 2 open security issues in bullseye.
2 issues left for the package maintainer to handle:
zip4j up to v2.10.0 can throw various uncaught exceptions while parsing a specially crafted ZIP file, which could result in an application crash. This could be used to mount a denial of service attack against services that use zip4j library.
Zip4j through 2.11.2, as used in Threema and other products, does not always check the MAC when decrypting a ZIP archive.
You can find information about how to handle these issues in the security team's documentation.