CVE-2026-42527 camel vulnerability
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.**).
Quick answer
apache camel should be reviewed and updated if it matches the affected versions. The recommended fix is to apply the vendor-supported patched version or the mitigation steps below, then retest the public website with Fixnx.
Who is affected
Affected versions
- 4.20.0
Fixed versions
- Apply the latest vendor-supported patched version.
How to fix it
CVE-2026-42527 affects Apache Camel Apache Camel. Upgrade Apache Camel on the deployed branch to 4.14.8, 4.18.3 and review any route that exposes this component to user-controlled messages, headers, files, or backend responses. Affected ranges in the local record are 4.14.0 through before 4.14.8; 4.18.0 through before 4.18.3.
- Inventory every service, route, integration runtime, container image, and dependency lockfile that includes Apache Camel Apache Camel or related Camel modules.
- Compare deployed Camel versions with the affected ranges for CVE-2026-42527; prioritize internet-facing routes, message brokers, file parsers, and integrations that process untrusted input.
- Upgrade to 4.14.8, 4.18.3, or to a later vendor-supported Camel release on the same branch.
- Rebuild application artifacts and container images from a clean dependency lockfile so vulnerable Camel modules are removed from direct and transitive dependencies.
- Harden route boundaries by filtering user-controlled Camel headers, component control headers, serialized objects, command arguments, paths, and backend response bodies before they reach Camel internals.
- Rotate credentials, tokens, queue secrets, and integration keys if the affected route could expose data, redirect backend requests, deserialize attacker-controlled objects, or execute unintended operations.
- Deploy first to staging, run regression tests for the impacted route, then promote to production with monitoring for route errors, deserialization events, SSRF indicators, unexpected command arguments, and authorization failures.
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Verify the fix
- Confirm dependency output shows Apache Camel 4.14.8, 4.18.3 or a later fixed release in every affected application.
- Replay malicious or unexpected headers, serialized payloads, paths, files, command arguments, and backend responses against the affected route and verify they are rejected or sanitized.
- Check application logs after deployment for exceptions, leaked stack traces, SSRF attempts, command execution anomalies, unauthorized backend operations, or unexpected route destinations.
- Open the generated Fixnx page and confirm the canonical URL ends with camel-cve-2026-42527.
- Re-run sitemap validation and confirm camel-cve-2026-42527 appears once in sitemap.xml with the full CVE-2026-42527 suffix.
Related categories
Trusted references
FAQ
What is affected by CVE-2026-42527?
apache camel versions listed as affected should be reviewed: 4.20.0.
What should I fix first?
Start with internet-facing sites, admin panels, login flows, plugins, themes, modules, packages, and systems that process user-controlled input or sensitive data.
How do I confirm the fix worked?
Apply the patched version or mitigation, clear caches where relevant, retest the affected workflow, and run a new Fixnx scan to verify public website exposure signals.
How are Fixnx security risk categories chosen?
Fixnx keeps one canonical risk page and assigns only broad, relevant categories such as ecosystem, technology area, or vulnerability class.