CVE-2026-86404
High
Description
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.
SeverityHigh
CVSS8.8
Exploit probability—
Product
Jboss Enterprise Application Platform 8.1
PublishedSep 7, 2026
First seenSep 7, 2026
Weakness typeCWE-502Deserialization of untrusted data
How to fix
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| jboss_enterprise_application_platform 8.1 | No range specified | — |
| Red Hat Red Hat JBoss Enterprise Application Platform 7 | No range specified | — |
| Red Hat Red Hat JBoss Enterprise Application Platform 8 | No range specified | — |
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