{"affected":[{"defaultStatus":"unaffected","ecosystem":"maven","packageName":"org.apache.activemq:apache-activemq","product":"Apache ActiveMQ","source":"CNA: apache","vendor":"Apache Software Foundation","versions":[{"lessThan":"6.3.3","status":"affected","version":"6.0.0","versionType":"semver"},{"lessThan":"5.19.12","status":"affected","version":"0","versionType":"semver"}]},{"defaultStatus":"unaffected","ecosystem":"maven","packageName":"org.apache.activemq:activemq-kahadb-store","product":"Apache ActiveMQ KahaDB","source":"CNA: apache","vendor":"Apache Software Foundation","versions":[{"lessThan":"6.3.3","status":"affected","version":"6.0.0","versionType":"semver"},{"lessThan":"5.19.12","status":"affected","version":"0","versionType":"semver"}]}],"cveId":"CVE-2026-111821","cwes":["CWE-20"],"description":"Improper input validation vulnerability in Apache ActiveMQ, Apache ActiveMQ KahaDB.\n\n\n\nA user can create a durable subscription with a clientId and subscription name that have a combined length > 65,535 (while separately being shorter) on a broker using KahaDB which can cause the broker to shutdown and be unrecoverable. \n\n\n\nThis issue affects Apache ActiveMQ: from 6.0.0 before 6.3.3, before 5.19.12; Apache ActiveMQ KahaDB: from 6.0.0 before 6.3.3, before 5.19.12.\n\n\n\nUsers are recommended to upgrade to version 6.4.0, 6.3.3 or 5.19.12, which fixes the issue.","epss":null,"exploits":[],"kev":null,"metrics":[],"modifiedAt":1793787445363,"publishedAt":1793787031596,"references":[{"source":"CNA: apache","tags":["vendor-advisory"],"url":"https://lists.apache.org/thread/p8gxq66lmztkrls74wkz3xh9chqd0pwl"},{"source":"ADP: CVE","tags":[],"url":"http://www.openwall.com/lists/oss-security/2026/11/03/19"},{"source":"security@apache.org","tags":[],"url":"https://lists.apache.org/thread/p8gxq66lmztkrls74wkz3xh9chqd0pwl"},{"source":"af854a3a-2127-422b-91ae-364da2661108","tags":[],"url":"http://www.openwall.com/lists/oss-security/2026/11/03/19"}],"remediation":[],"revision":"b3373de8422b8b3c8a2f7ac45d0eee702c98631b1ad043114991812da3949feb","sources":[{"modifiedAt":1793787041422,"name":"CNA: apache","retrievedAt":1793790521410,"url":"https://www.cve.org/CVERecord?id=CVE-2026-111821"},{"modifiedAt":1793787445363,"name":"NVD","retrievedAt":1793794571948,"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-111821"}],"ssvc":null,"status":"published","title":"Apache ActiveMQ, Apache ActiveMQ KahaDB: Oversized client identifier strings poison the KahaDB journal","updatedAt":1793794571948}