by Kastro
Paper/Archive/CVE-2026-66909

CVE-2026-66909

Apache Software Foundation Apache CXF — Apache CXF: Unsafe deserialization of inbound JMS ObjectMessage

EPSS 1%CVSS 9.8
critical.is priorityof 100
43
CVSS 9.8 (ADP)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 66.9.669 × 2013.4No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Apache CXF4.2.0 – < 4.2.34.2.3CNA
Apache CXF4.0.0 – < 4.1.84.1.8CNA
Apache CXF< 3.6.123.6.12CNA

Scores by source

CISA ADP9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total

References

advisorylists.apache.org/thread/lr5d4tg6tf7j29jmw8wt242oowonjqpxrefopenwall.com/lists/oss-security/2026/08/06/18