Deserialization of Untrusted Data in Apache CXF - CVE-2026-66909
Published: August 24, 2026
Vulnerability identifier: #VU144826
CSH Severity: High
CVSS v4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-66909
CWE-ID: CWE-502
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vulnerability details
The vulnerability allows a remote attacker to execute arbitrary code or cause a denial of service.
The vulnerability exists due to unsafe deserialization in the JMS transport when processing an inbound JMS ObjectMessage. A remote attacker can place a malicious serialized object on the service's JMS destination to execute arbitrary code or cause a denial of service.
Remote code execution is possible if a suitable gadget class is present on the classpath.
Affected software
Apache CXF
How to mitigate CVE-2026-66909
Install security update from vendor's website.
Apache CXF - addressed in versions 3.6.12, 4.1.8, 4.2.3