{"schemaVersion":3,"id":"CVE-2026-86404","aliases":[],"status":"published","duplicateOf":null,"title":null,"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.","dates":{"published":"2026-09-07T11:35:04.324Z","modified":"2026-10-19T19:00:06.855Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.8,"severity":"high","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00855,"percentile":0.57671,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":0.35900000000000004,"baselineDate":"2026-09-19T00:00:00.000Z","baselineScore":0.00496},"history":[{"date":"2026-09-14T00:00:00.000Z","score":0.0045,"percentile":null},{"date":"2026-09-15T00:00:00.000Z","score":0.0045,"percentile":null},{"date":"2026-09-16T00:00:00.000Z","score":0.0045,"percentile":null},{"date":"2026-09-17T00:00:00.000Z","score":0.0045,"percentile":null},{"date":"2026-09-18T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-19T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00606,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00855,"percentile":0.57671}],"last30":[{"date":"2026-09-19T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-20T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-21T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-22T00:00:00.000Z","score":0.00496,"percentile":null},{"date":"2026-09-23T00:00:00.000Z","score":0.00606,"percentile":null},{"date":"2026-09-24T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-25T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-26T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-27T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-28T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-29T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-09-30T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-01T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-02T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-03T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-04T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-05T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-06T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-07T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-08T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00855,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00855,"percentile":0.57671}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-502","name":"Deserialization of Untrusted Data","description":"The product deserializes untrusted data without sufficiently ensuring that the resulting data will be valid.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/502.html"}],"affected":[],"affectedCount":0,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://access.redhat.com/errata/RHSA-2026:53644","label":"access.redhat.com/errata/RHSA-2026:53644","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:53645","label":"access.redhat.com/errata/RHSA-2026:53645","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:53646","label":"access.redhat.com/errata/RHSA-2026:53646","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:53806","label":"access.redhat.com/errata/RHSA-2026:53806","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70228","label":"access.redhat.com/errata/RHSA-2026:70228","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70229","label":"access.redhat.com/errata/RHSA-2026:70229","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70230","label":"access.redhat.com/errata/RHSA-2026:70230","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/errata/RHSA-2026:70277","label":"access.redhat.com/errata/RHSA-2026:70277","hostname":"access.redhat.com","tags":["Vendor Advisory","X Refsource REDHAT"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-86404","label":"access.redhat.com/security/cve/CVE-2026-86404","hostname":"access.redhat.com","tags":["VDB Entry","X Refsource REDHAT"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2477930","label":"bugzilla.redhat.com/show_bug.cgi?id=2477930","hostname":"bugzilla.redhat.com","tags":["Issue Tracking","X Refsource REDHAT"]}],"lineage":{"upstream":[],"downstream":["RHSA-2026:53644","RHSA-2026:53645","RHSA-2026:53646","RHSA-2026:70228","RHSA-2026:70229","RHSA-2026:70230"],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-09-07T11:35:04.324Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-19T19:00:06.855Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":35,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T05:17:13.037Z","stale":false,"partial":false}}