{"id":"CVE-2026-86404","aliases":[],"url":"https://o3.security/vulnerability/CVE-2026-86404","summary":"EAP's Artemis deserialization configuration permits deserialization by default. ObjectMessage.getObject() uses ObjectInputStreamWithClassLoader, which implements allow-list/block-list…","details":"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":"2026-09-07T12:17:21.840","modified":"2026-09-07T14:16:56.620","cvss":{"score":8.8,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[],"fix":null,"references":[{"type":"WEB","url":"https://access.redhat.com/errata/RHSA-2026:53644"},{"type":"WEB","url":"https://access.redhat.com/security/cve/CVE-2026-86404"},{"type":"WEB","url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477930"}],"provenance":{"sources":["OSV.dev","NVD","FIRST.org (EPSS)"],"lastVerified":"2026-09-07T14:16:56.620"}}