Apache Ignite 2.5 and earlier serialization mechanism does not have a list of classes allowed for serialization/deserialization, which makes it possible to run arbitrary code when 3-rd party vulnerable classes are present in Ignite classpath. The vulnerability can be exploited if the one sends a specially prepared form of a serialized object to GridClientJdkMarshaller deserialization endpoint.
access.redhat.com/errata/RHSA-2018:3768
github.com/advisories/GHSA-qcjv-wfcg-mmpr
github.com/apache/ignite/commit/82a7b8209fcf56971d12cb10410a38ed632215b
issues.apache.org/jira/browse/IGNITE-8565
lists.apache.org/thread.html/e0fdf53114a321142ecfa5cfa17658090f0b4e1677de431e329b37ab@%3Cdev.ignite.apache.org%3E
nvd.nist.gov/vuln/detail/CVE-2018-8018