Hi @Jörg Werner
Currently we have no formal announcement from Atlassian. I would indeed take a look at the links provided by Stephen and keep a look out at the community as well.
Look for a formal announcement from Atlassian, however my findings are as follows:
This CVE is for jsonwebtoken <= 8.5.1.
* I say "likely" here as I have no real way of knowing what they do internally, so again, look for a formal announcement from Atlassian.