CVE-2026-42527

Description

Deserialization of Untrusted Data vulnerability in Apache Camel. The default ObjectInputFilter pattern shipped with several Apache Camel components for defense-in-depth deserialization filtering (-java.**;javax.**;org.apache.camel.**;!*-, or the no--javax.**- variant in the aggregation-repository components) uses a recursive -java.**- glob that admits classes whose hashCode/equals/readObject methods perform network I/O, notably java.net.URL and java.net.InetAddress. When an attacker can deliver a Java-serialized payload to an affected Camel consumer, deserialization of a HashMap (or any collection that calls hashCode on its elements) containing java.net.URL keys causes the JVM to issue DNS queries to the attacker-supplied host during the deserialization side-effect. The class-level filter check passes because the resulting object-s class (HashMap) is allow-listed; the DNS query is observable on an attacker-controlled DNS server, providing an out-of-band side channel. The exposure is highest on the camel-jms family because JmsBinding.extractBodyFromJms invokes ObjectMessage.getObject() unconditionally when mapJmsMessage=true (default). Affected components: camel-jms, camel-sjms, camel-amqp, camel-mina, camel-netty, camel-netty-http, camel-vertx-http, camel-infinispan, and the aggregation repository components camel-leveldb, camel-cassandraql, camel-consul, camel-sql (JDBC aggregation repository). This issue affects Apache Camel: from 4.14.0 before 4.14.8, from 4.15.0 before 4.18.3, from 4.19.0 before 4.21.0. Users are recommended to upgrade to a version that contains the CAMEL-23372 fix once available: 4.21.0 for the 4.21.x line, 4.18.3 for the 4.18.x line, and 4.14.8 for the 4.14.x line. For deployments that cannot upgrade immediately, configure a JMS-provider-side allow-list (Apache ActiveMQ Artemis -deserializationAllowList- / -deserializationDenyList-, Apache ActiveMQ Classic -org.apache.activemq.SERIALIZABLE_PACKAGES-) as the primary mitigation, and/or override the in-code default via the endpoint-level -deserializationFilter- option or the JVM-wide --Djdk.serialFilter- system property with an explicit deny: -!java.net.**;java.**;javax.**;org.apache.camel.**;!*- (or -!java.net.**;java.**;org.apache.camel.**;!*- for the aggregation-repository components, which do not include javax.**).