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https://issues.apache.org/jira/browse/CAMEL-23803?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrea Cosentino resolved CAMEL-23803.
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Resolution: Fixed
> camel-jackson-avro / camel-jackson-protobuf: block unsafe polymorphic base
> types by default in the data format ObjectMapper
> ---------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-23803
> URL: https://issues.apache.org/jira/browse/CAMEL-23803
> Project: Camel
> Issue Type: Improvement
> Components: camel-jackson-avro
> Reporter: Andrea Cosentino
> Assignee: Andrea Cosentino
> Priority: Major
>
> h3. Problem
> Follow-up to CAMEL-23786 (camel-jackson), raised in review of
> apache/camel#24134. The same missing {{BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES}}
> guard exists in the sibling Jackson data formats, while their {{transform/}}
> counterparts already enable it:
> * camel-jackson-avro: {{JacksonAvroDataFormat.createNewObjectMapper()}}
> returns a bare {{new AvroMapper()}}; {{transform/Avro.java}} enables the
> feature.
> * camel-jackson-protobuf:
> {{JacksonProtobufDataFormat.createNewObjectMapper()}} returns a bare {{new
> ProtobufMapper()}}; {{transform/Protobuf.java}} enables the feature.
> When polymorphic / default typing is enabled, these mappers are exposed to
> gadget-chain deserialization on untrusted input.
> h3. Suggested fix
> Enable {{MapperFeature.BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES}} by default in
> each {{createNewObjectMapper()}} (mirroring the respective {{transform/}}
> mapper and CAMEL-23786), each with a test and an upgrade-guide note.
> h3. Note on camel-jackson3
> camel-jackson3 (Jackson 3.x) was investigated: no code enables this
> MapperFeature, and Jackson 3 reworked default typing (mandatory
> PolymorphicTypeValidator), so BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES likely does
> not apply. Excluded pending a dedicated Jackson-3 review.
> h3. Acceptance criteria
> * camel-jackson-avro createNewObjectMapper enables
> BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES
> * camel-jackson-protobuf createNewObjectMapper enables
> BLOCK_UNSAFE_POLYMORPHIC_BASE_TYPES
> * Tests assert the feature is enabled on each data format's default mapper
> * Upgrade-guide note documenting the hardened default and opt-out
> _Created by Claude Code on behalf of Andrea Cosentino._
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