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).
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)
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
- RHSA-2026:70228 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:70229 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:70230 vendor-advisory, x_refsource_REDHAT
- RHSA-2026:70277 vendor-advisory, x_refsource_REDHAT
- https://access.redhat.com/security/cve/CVE-2026-86404 vdb-entry, x_refsource_REDHAT
- RHBZ#2477930 issue-tracking, x_refsource_REDHAT