{"id":"CVE-2026-50734","summary":"Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All: Pre-authentication OpenWire memory-allocation DoS during wire format negotiation","details":"Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All.\n\nAn unauthenticated network attacker can cause a broker DoS by sending a crafted WireFormatInfo frame with a malicious large size value. The value is not validate and causes the broker to attempt allocation during pre-auth negotiation which can trigger OOM and crash the broker.\nThis issue affects Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7.\n\nUsers are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.","aliases":["BIT-activemq-2026-50734"],"modified":"2026-07-08T08:09:43.404476424Z","published":"2026-06-30T09:53:03.435Z","database_specific":{"cwe_ids":["CWE-789"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50734.json","cna_assigner":"apache","unresolved_ranges":[{"source":"AFFECTED_FIELD","extracted_events":[{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"}]},{"source":"DESCRIPTION","extracted_events":[{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"}]}]},"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/29/10"},{"type":"WEB","url":"https://repo.maven.apache.org/maven2"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/50xxx/CVE-2026-50734.json"},{"type":"ADVISORY","url":"https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50734"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/apache/activemq","events":[{"introduced":"0"},{"fixed":"7d56ebc8e04dd0a2a14545cfa05883f9bdba72a2"},{"introduced":"14bac13f40958c1a1d3d198051eed32facc4abd1"},{"fixed":"f3e61919b374ee5b124f80458334c314fc2cb29d"}],"database_specific":{"source":"CPE_RANGE","cpe":"cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"}]}}],"versions":["activemq-6.2.1","activemq-5.19.2","activemq-6.2.0","activemq-5.19.1","activemq-5.19.0","activemq-5.18.6","activemq-5.18.5","activemq-6.1.2","activemq-5.18.4","activemq-6.1.1","activemq-6.1.0","activemq-6.0.0","activemq-5.18.3","activemq-5.18.2","activemq-5.18.1","activemq-5.18.0","activemq-5.16.0","activemq-5.15.0","activemq-5.14.0","activemq-5.13.0","activemq-5.12.0","activemq-5.11.0","activemq-5.10.0","activemq-5.9.0"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-50734.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}