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Vulnerability · Published Sep 7, 2026 · Assigned by redhat

CVE-2026-86404Artemis-server: artemis-jms-client: artemis-core-client: undertow-core: wildfly-messaging-activemq-subsystem: artemis messaging handlers in red hat eap permit deserialization by default

High 8.8

In plain English

A high-severity unsafe deserialization in Red Hat JBoss Enterprise Application Platform 8.1.8.GA from Red Hat. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.7%top 46.7% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
Red Hat Red Hat JBoss Enterprise Application Platform 8.1.8.GA see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references
Red Hat Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10 see references

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

References