Deserialization in Red Hat Jboss Enterprise Application Platform 7
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.
Vulnerability class: Insecure Deserialization
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
Weakness classification (CWE)
References
- secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
- RHBZ#2477930 (x_refsource_REDHAT, issue-tracking)
- RHSA-2026:53644 (vendor-advisory, x_refsource_REDHAT)
Frequently asked questions
- What is CVE-2026-86404?
- CVE-2026-86404 is a high-severity vulnerability in Red Hat Jboss Enterprise Application Platform 7, classified under Deserialization of Untrusted Data. CVSS score: 8.8/10. Published 2026-09-07.
- How severe is CVE-2026-86404?
- High severity. CVSS v3 base score is 8.8 out of 10.