As of February 2022 (and until this document is updated), the latest version v4 is supported.
If you think you found a vulnerability, and even if you are not sure, please report it to jwt-go-security@googlegroups.com or one of the other golang-jwt maintainers. Please try be explicit, describe steps to reproduce the security issue with code example(s).
You will receive a response within a timely manner. If the issue is confirmed, we will do our best to release a patch as soon as possible given the complexity of the problem.
Please avoid publicly discussing a potential security vulnerability.
Let's take this offline and find a solution first, this limits the potential impact as much as possible.
We appreciate your help!