Medium (6.9) in samrocketman jervis. EPSS 0.2% chance of exploitation in the next 30 days. Fixed in net.gleske:jervis 2.2.
Jervis is a library for Job DSL plugin scripts and shared Jenkins pipeline libraries. Prior to 2.2, the code doesn't validate that the JWT header specifies "alg":"RS256". This vulnerability is fixed in 2.2.