Jenkins versions 2.56 and earlier as well as 2.46.1 LTS and earlier are vulnerable to an XStream: Java crash when trying to instantiate void/Void.
{
"versions": [
{
"introduced": "0"
},
{
"last_affected": "2.56"
},
{
"introduced": "0"
},
{
"last_affected": "2.46.1"
}
]
}