Skip to content
Fencer Intel
critical 9.8

CVE-2026-66909 json

Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage

published 3mo ago modified 18d ago also EUVD-2026-53854

cvss
9.8
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
1.1%
EPSS 1.1% chance of exploitation in 30 days, percentile 67%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apache Software Foundation Apache CXF 3.6.12, 4.1.8, 4.2.3

Is CVE-2026-66909 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-66909 updated cvss 8.1

org.apache.cxf/cxf: Apache CXF: Remote Code Execution via unsafe deserialization of JMS ObjectMessage

  • Red Hat JBoss Enterprise Application Platform 7 eap74-els-openjdk8-openshift-rhel8, eap74-els-openjdk11-openshift-rhel8, eap74-els-openjdk17-openshift-rhel8, jboss-eap-7-eap74-els-openjdk8-openshift-rhel8, jboss-eap-7-eap74-els-openjdk17-openshift-rhel8
    affected: workaround, no fix planned “Will not fix”
  • Red Hat Single Sign-On 7 cxf-rt-transports-jms
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat build of Apache Camel 4.18.4 for Spring Boot 3.5.16
    fixed: vendor fix RHSA-2026:71675
  • Red Hat JBoss EAP 7.4 ELS for RHEL 7 Server eap7-wildfly 7.4.26-5.GA_redhat_00002.1.el7eap, eap7-undertow 2.2.40-3.SP4_redhat_00001.1.el7eap, eap7-jackson-core 2.18.10-1.redhat_00001.1.el7eap, eap7-apache-cxf 3.5.11-2.SP2_redhat_00001.1.el7eap, eap7-apache-cxf-rt 3.5.11-2.SP2_redhat_00001.1.el7eap, eap7-jackson-databind 2.18.10-1.redhat_00001.1.el7eap, +21 more
    fixed: vendor fix RHSA-2026:99097
  • Red Hat JBoss EAP 7.4 ELS for RHEL 8 eap7-wildfly 7.4.26-5.GA_redhat_00002.1.el8eap, eap7-undertow 2.2.40-3.SP4_redhat_00001.1.el8eap, eap7-jackson-core 2.18.10-1.redhat_00001.1.el8eap, eap7-apache-cxf 3.5.11-2.SP2_redhat_00001.1.el8eap, eap7-apache-cxf-rt 3.5.11-2.SP2_redhat_00001.1.el8eap, eap7-jackson-databind 2.18.10-1.redhat_00001.1.el8eap, +22 more
    fixed: vendor fix RHSA-2026:99098
  • Red Hat JBoss EAP 7.4 ELS for RHEL 9 eap7-wildfly 7.4.26-5.GA_redhat_00002.1.el9eap, eap7-undertow 2.2.40-3.SP4_redhat_00001.1.el9eap, eap7-jackson-core 2.18.10-1.redhat_00001.1.el9eap, eap7-apache-cxf 3.5.11-2.SP2_redhat_00001.1.el9eap, eap7-apache-cxf-rt 3.5.11-2.SP2_redhat_00001.1.el9eap, eap7-jackson-databind 2.18.10-1.redhat_00001.1.el9eap, +22 more
    fixed: vendor fix RHSA-2026:99099
  • Red Hat JBoss Enterprise Application Platform 7.4
    fixed: vendor fix RHSA-2026:99096
  • Red Hat JBoss Enterprise Application Platform 8.1
    fixed: vendor fix RHSA-2026:95887
show 1 more
  • Red Hat JBoss Enterprise Application Platform Expansion Pack cxf-rt-transports-jms
    not affected: component not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
yes
Technical impact
total
Assessed
3mo ago

Exploit prediction

1.15% chance of exploitation in the next 30 days, higher than 67% of all scored CVEs (FIRST EPSS, 2026-11-11).

CVSS scores

assigned by version score vector
CISA ADP 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CNA 3.1 9.8 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

  • Apache Software Foundation Apache CXF

Classification

Weakness
  • CWE-502 Deserialization of Untrusted Data

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.