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Posted to dev@kylin.apache.org by "PJ Fanning (Jira)" <ji...@apache.org> on 2026/07/21 15:56:00 UTC

[jira] [Created] (KYLIN-6092) Insecure Jackson deserialization

PJ Fanning created KYLIN-6092:
---------------------------------

             Summary: Insecure Jackson deserialization
                 Key: KYLIN-6092
                 URL: https://issues.apache.org/jira/browse/KYLIN-6092
             Project: Kylin
          Issue Type: Task
            Reporter: PJ Fanning


[https://github.com/apache/kylin/blob/b5b94b51abaf83d68088e4fcab606d2a6530e54d/src/core-common/src/main/java/org/apache/kylin/common/persistence/event/Event.java#L33]

`@JsonTypeInfo(use = JsonTypeInfo.Id.CLASS)` – when you deserialize the `@class` value that appears in the JSON can be any class name and Jackson will load that class and try to create an instance.

You should add a polymorphic type validator to your ObjectMapper that restricts which classes can be loaded at deserialization time.

https://fasterxml.github.io/jackson-databind/javadoc/2.10/com/fasterxml/jackson/databind/jsontype/BasicPolymorphicTypeValidator.html

 



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