CVE-2026-86404

EAP's Artemis deserialization configuration permits deserialization by default. ObjectMessage.getObject() uses ObjectInputStreamWithClassLoader, which implements allow-list/block-list filtering via its checkSecurity()/isTrustedType() method. However, by default both allow-list and block-list are empty. When the allow-list is empty (size == 0), isTrustedType() returns true for ALL classes. This means all classes are deserializable by default.

Scoring

Severity

HIGH

CVSS base score

8.8

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS probability

0.45%

CWE

CWE-502

Published

2026-09-07

Last modified

2026-09-09

Affected products

• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7
• Red Hat Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7

Weakness type

• CWE-502

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