CVE-2026-66909

CVE Details

Release Date:	2026-08-06
Impact:	Important	What is this?

Description

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.

See more information about CVE-2026-66909 from MITRE CVE dictionary and NIST NVD

NOTE: The following CVSS metrics and score provided are preliminary and subject to review.

CVSS v3 metrics

Base Score:	8.1
Vector String:	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Version:	3.1
Attack Vector:	Network
Attack Complexity:	High
Privileges Required:	None
User Interaction:	None
Scope:	Unchanged
Confidentiality Impact:	High
Integrity Impact:	High
Availability Impact:	High

Errata information

Platform	Errata	Release Date
Oracle Linux version 8 (ovirt-engine-wildfly)	ELSA-2026-500570	2026-11-04
Oracle Linux version 8 (ovirt-engine-wildfly-overlay)	ELSA-2026-500570	2026-11-04
Oracle Linux version 9 (ovirt-engine-wildfly)	ELSA-2026-500571	2026-11-04
Oracle Linux version 9 (ovirt-engine-wildfly-overlay)	ELSA-2026-500571	2026-11-04