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.
- Published Sep 7, 2026
- CVSS 8.8 high
- 0.9% chance of exploitation in the next 30 days (EPSS)
- A fix is available