{"schema_version": "1.6.1", "id": "CVE-2026-66909", "summary": "Unsafe deserialization of inbound JMS ObjectMessage", "details": "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.", "affected": [{"ranges": [{"type": "SEMVER", "events": [{"introduced": "4.2.0"}, {"fixed": "4.2.3"}]}, {"type": "SEMVER", "events": [{"introduced": "4.0.0"}, {"fixed": "4.1.8"}]}, {"type": "SEMVER", "events": [{"introduced": "0"}, {"fixed": "3.6.12"}]}]}], "references": [{"type": "WEB", "url": "https://lists.apache.org/thread/lr5d4tg6tf7j29jmw8wt242oowonjqpx"}]}