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https://issues.apache.org/jira/browse/CAMEL-24998?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrea Cosentino resolved CAMEL-24998.
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Resolution: Not A Problem
Resolved as Not A Problem: HiveMQConsumer.onMessage() only sets three
fixed-name headers (CamelHiveMQTopic, CamelHiveMQQos, CamelHiveMQRetained) from
MQTT publish metadata and does not map MQTT5 user properties or any
sender-chosen header name, so a publisher cannot inject Camel* headers.
Applying the default HeaderFilterStrategy filtered the component's own headers
instead. PR closed:
https://github.com/apache/camel/pull/26890#issuecomment-5874369812
> camel-hivemq: consumer is missing a HeaderFilterStrategy, allowing
> Camel-internal headers to be injected from the MQTT message
> ------------------------------------------------------------------------------------------------------------------------------
>
> Key: CAMEL-24998
> URL: https://issues.apache.org/jira/browse/CAMEL-24998
> Project: Camel
> Issue Type: Improvement
> Reporter: Andrea Cosentino
> Assignee: Andrea Cosentino
> Priority: Major
>
> HiveMQConsumer.onMessage() maps the inbound MQTT publish topic name and flags
> to CamelHiveMQ* Exchange headers without applying a HeaderFilterStrategy.
> There is no filter anywhere in the component. This means:
> 1. An attacker who can publish to a subscribed MQTT topic can inject
> arbitrary Camel* headers that survive onto the Exchange, bypassing the
> DefaultHeaderFilterStrategy that other consumers apply to block the
> internal-dispatch namespace (the CVE-2025-27636 class).
> 2. If the Exchange flows to a camel-hivemq producer (e.g. as a bridge), the
> CamelHiveMQOverrideTopic header - if injected - would drive where the message
> is republished.
> The fix is to add a headerFilterStrategy field to HiveMQEndpoint (defaulting
> to DefaultHeaderFilterStrategy) and apply it when populating Exchange headers
> in HiveMQConsumer, following the pattern used by components fixed in the
> CVE-2025-27636 family.
> Affected files:
> -
> components/camel-hivemq/src/main/java/org/apache/camel/component/hivemq/HiveMQConsumer.java
> -
> components/camel-hivemq/src/main/java/org/apache/camel/component/hivemq/HiveMQEndpoint.java
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