Apache CXF JMS Transport Deserialization RCE (up to 4.2.2)
CVE-2026-66909 Published on August 6, 2026
Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage
Apache CXF's JMS transport deserializes the body of any inbound JMS ObjectMessage using native Java deserialization, with no type restrictions in place. Any attacker able to place a message on the service's JMS destination can submit a malicious serialized object, leading to denial of service or, if a suitable gadget class is on the classpath, remote code execution. The fix disables ObjectMessage deserialization by default, with a configuration switch to re-enable it if needed. Users are recommended to upgrade to versions 4.2.3 or 4.1.8 or 3.6.12, which fix this issue.
Weakness Type
What is a Marshaling, Unmarshaling Vulnerability?
The application deserializes untrusted data without sufficiently verifying that the resulting data will be valid.
CVE-2026-66909 has been classified to as a Marshaling, Unmarshaling vulnerability or weakness.
Products Associated with CVE-2026-66909
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Affected Versions
Apache Software Foundation Apache CXF:- Version 4.2.0 and below 4.2.3 is affected.
- Version 4.0.0 and below 4.1.8 is affected.
- Before 3.6.12 is affected.