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This switches ObjectInputStreamWithClassLoader from \"allow everything\" to \"deny by default, allow only listed classes.\" With this in place, even if an attacker injects a malicious ObjectMessage through any vector, the deserialization of gadget chain classes is blocked."}],"x_generator":{"engine":"cvelib 1.8.0"},"x_redhatCweChain":"CWE-502: Deserialization of Untrusted Data"}},"cveMetadata":{"assignerOrgId":"53f830b8-0a3f-465b-8143-3b8a9948e749","assignerShortName":"redhat","cveId":"CVE-2026-86404","datePublished":"2026-09-07T11:35:04.324Z","dateReserved":"2026-09-07T11:24:28.229Z","dateUpdated":"2026-09-09T14:23:36.668Z","state":"PUBLISHED"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-09-07 12:17:21","lastModifiedDate":"2026-09-09 15:17:17","problem_types":["CWE-502","CWE-502 Deserialization of Untrusted Data"],"metrics":{"cvssMetricV31":[{"source":"secalert@redhat.com","type":"Secondary","cvssData":{"version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":8.8,"baseSeverity":"HIGH","attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"HIGH","integrityImpact":"HIGH","availabilityImpact":"HIGH"},"exploitabilityScore":2.8,"impactScore":5.9}],"ssvcV203":[{"source":"134c704f-9b21-4f2e-91b3-4a467353bcc0","ssvcData":{"timestamp":"2026-09-09T14:23:26.132092Z","id":"CVE-2026-86404","options":[{"exploitation":"none"},{"automatable":"no"},{"technicalImpact":"total"}],"role":"CISA Coordinator","version":"2.0.3"}}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"86404","Ordinal":"1","Title":"Artemis-server: artemis-jms-client: artemis-core-client: underto","CVE":"CVE-2026-86404","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"86404","Ordinal":"1","NoteData":"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.","Type":"Description","Title":"Artemis-server: artemis-jms-client: artemis-core-client: underto"}]}}}