Jenkins 2.333 and earlier, LTS 2.319.2 and earlier defines custom XStream converters that have not been updated to apply the protections for the vulnerability CVE-2021-43859 and allow unconstrained resource usage.
{
"versions": [
{
"introduced": "0"
},
{
"fixed": "2.319.3"
},
{
"introduced": "0"
},
{
"fixed": "2.334"
}
]
}