A sandbox bypass vulnerability in Jenkins Script Security Plugin 1.64 and earlier related to the handling of default parameter expressions in constructors allowed attackers to execute arbitrary code in sandboxed scripts.
https://jenkins.io/security/advisory/2019-10-01/#SECURITY-1579
https://access.redhat.com/errata/RHSA-2019:4097
https://access.redhat.com/errata/RHSA-2019:4089