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https://issues.apache.org/jira/browse/CAMEL-23786?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrea Cosentino resolved CAMEL-23786.
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Resolution: Fixed
> camel-jackson: block unsafe polymorphic base types by default in the data
> format ObjectMapper
> ---------------------------------------------------------------------------------------------
>
> Key: CAMEL-23786
> URL: https://issues.apache.org/jira/browse/CAMEL-23786
> Project: Camel
> Issue Type: Improvement
> Components: camel-jackson
> Reporter: Andrea Cosentino
> Assignee: Andrea Cosentino
> Priority: Major
> Fix For: 4.14.8, 4.18.3, 4.21.0
>
>
> h3. Problem
> {{JacksonDataFormat.createNewObjectMapper()}} builds a bare {{new
> ObjectMapper()}} without enabling
> {{MapperFeature.BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES}}. The sibling
> {{transform/Json.java}} already enables this guard. Users who enable
> polymorphic typing (via enableFeatures/moduleClassNames) are then exposed to
> gadget-chain deserialization on untrusted input.
> h3. Evidence
> *
> components/camel-jackson/src/main/java/org/apache/camel/component/jackson/JacksonDataFormat.java:88
> (new ObjectMapper())
> * compare
> components/camel-jackson/src/main/java/org/apache/camel/component/jackson/transform/Json.java
> h3. Suggested fix
> Enable MapperFeature.BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES by default in
> createNewObjectMapper(); document as a hardening default in the upgrade guide.
> h3. Acceptance criteria
> * createNewObjectMapper enables BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES by default
> * Consistent with transform/Json.java
> * Upgrade guide documents the hardened default and how to opt out if required
> * A test confirms an unsafe polymorphic base type is blocked by default
> _Created by Claude Code on behalf of Andrea Cosentino._
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