# CVE-2026-86404

## Summary

- **CVE ID:** CVE-2026-86404
- **Severity:** HIGH
- **CVSS Score:** 8.8 (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** CWE-502
- **Published:** Sep 7, 2026
- **Last Modified:** Sep 9, 2026

## 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

- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.16.0-22.redhat_00057.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.3.14-11.SP11_redhat_00001.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:1.5.26-2.Final_redhat_00001.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.18.8-1.redhat_00003.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:5.0.31-3.SP2_redhat_00001.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:1.10.0-46.Final_redhat_00044.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:4.1.135-1.Final_redhat_00001.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.5.5-30.SP12_redhat_00020.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.5.5-24.SP12_redhat_00016.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:2.2.40-2.SP3_redhat_00001.1.el7eap)
- Red Hat — Red Hat JBoss Enterprise Application Platform 7.4 ELS on RHEL 7 (0:7.4.25-2.GA_redhat_00001.1.el7eap)

## References

- [CNA](https://access.redhat.com/security/cve/CVE-2026-86404)
- [CNA](https://bugzilla.redhat.com/show_bug.cgi?id=2477930)
- [CNA](https://access.redhat.com/errata/RHSA-2026:53644)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.45%
- **EPSS Percentile:** 37.9

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._