CVE-2026-66909: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache CXF
Apache CXF's JMS transport component is vulnerable to deserialization of untrusted data via JMS ObjectMessage bodies. This vulnerability allows an attacker who can send messages to the JMS destination to submit malicious serialized objects, potentially causing denial of service or remote code execution if a suitable gadget class is present. The issue is fixed by disabling ObjectMessage deserialization by default and providing a configuration option to re-enable it if necessary. Users should upgrade to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12 to address this vulnerability.
AI Analysis
Technical Summary
The vulnerability in Apache CXF involves the JMS transport deserializing the body of any inbound JMS ObjectMessage using native Java deserialization without type restrictions. This lack of validation enables attackers who can place messages on the JMS destination to submit malicious serialized objects. Exploitation can lead to denial of service or remote code execution if a suitable gadget class is available on the classpath. The fix disables ObjectMessage deserialization by default and introduces a configuration switch to re-enable it if needed. The recommended remediation is to upgrade to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12 where this issue is resolved.
Potential Impact
Successful exploitation can result in full system compromise through remote code execution or denial of service. The vulnerability has a CVSS score of 9.8 (critical), indicating high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Upgrade Apache CXF to version 4.2.3, 4.1.8, or 3.6.12 where the vulnerability is fixed. The fix disables JMS ObjectMessage deserialization by default, mitigating the risk. If deserialization is required, it can be re-enabled via configuration with caution. Patch status is confirmed by vendor advisory information embedded in the description.
CVE-2026-66909: CWE-502 Deserialization of Untrusted Data in Apache Software Foundation Apache CXF
Description
Apache CXF's JMS transport component is vulnerable to deserialization of untrusted data via JMS ObjectMessage bodies. This vulnerability allows an attacker who can send messages to the JMS destination to submit malicious serialized objects, potentially causing denial of service or remote code execution if a suitable gadget class is present. The issue is fixed by disabling ObjectMessage deserialization by default and providing a configuration option to re-enable it if necessary. Users should upgrade to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12 to address this vulnerability.
CVSS v3.1
Score 9.8critical
Affected software
Apache Software Foundation
Apache CXF
pkg:maven/Apache Software Foundation/org.apache.cxf:cxf-rt-transports-jmsRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in Apache CXF involves the JMS transport deserializing the body of any inbound JMS ObjectMessage using native Java deserialization without type restrictions. This lack of validation enables attackers who can place messages on the JMS destination to submit malicious serialized objects. Exploitation can lead to denial of service or remote code execution if a suitable gadget class is available on the classpath. The fix disables ObjectMessage deserialization by default and introduces a configuration switch to re-enable it if needed. The recommended remediation is to upgrade to Apache CXF versions 4.2.3, 4.1.8, or 3.6.12 where this issue is resolved.
Potential Impact
Successful exploitation can result in full system compromise through remote code execution or denial of service. The vulnerability has a CVSS score of 9.8 (critical), indicating high impact on confidentiality, integrity, and availability. No known exploits in the wild have been reported at this time.
Mitigation Recommendations
Upgrade Apache CXF to version 4.2.3, 4.1.8, or 3.6.12 where the vulnerability is fixed. The fix disables JMS ObjectMessage deserialization by default, mitigating the risk. If deserialization is required, it can be re-enabled via configuration with caution. Patch status is confirmed by vendor advisory information embedded in the description.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- apache
- Date Reserved
- 2026-07-28T09:44:19.058Z
- State
- PUBLISHED
Threat ID: 6a746c04bf8831d5399ecea7
Added to database: 08/06/2026, 11:12:04 UTC
Last enriched: 08/13/2026, 16:59:08 UTC
Last updated: 09/20/2026, 22:01:36 UTC
Views: 86
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