CRITICAL

CVE-2026-66909

CVSS v3

9.8

CRITICAL

EPSS Score

1.1 %

exploit probability, as of 2026-09-25

CISA KEV

known exploited

Exploitation

—

SSVC status

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 recomme

Technical details

Published: 2026-08-06
Last Modified: 2026-08-07

Frequently asked questions

What is CVE-2026-66909?

Is CVE-2026-66909 actively exploited?

Active exploitation of CVE-2026-66909 has not been confirmed. Its EPSS score was 1.1% on 2026-09-25, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2026-66909?

CVE-2026-66909 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-66909 affecting your environment?

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