{"id":"CVE-2026-50734","aliases":["BIT-activemq-2026-50734","GHSA-7259-vf48-52q3"],"url":"https://o3.security/vulnerability/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.","published":"2026-06-30T09:53:03.435Z","modified":"2026-11-04T16:25:46.181028122Z","cvss":{"score":7.5,"severity":"HIGH","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},"epss":{"score":0.00544,"percentile":0.4299,"asOf":"2026-08-14"},"cisaKev":null,"exploitsKnown":0,"affectedPackages":[{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","fixedVersion":"5.19.8"},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-client","fixedVersion":"6.2.7"},{"ecosystem":"Maven","name":"org.apache.activemq:apache-activemq","fixedVersion":"5.19.8"},{"ecosystem":"Maven","name":"org.apache.activemq:apache-activemq","fixedVersion":"6.2.7"},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-all","fixedVersion":"5.19.8"},{"ecosystem":"Maven","name":"org.apache.activemq:activemq-all","fixedVersion":"6.2.7"}],"fix":{"url":"https://github.com/apache/activemq/pull/2080","label":"apache/activemq#2080"},"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"},{"type":"WEB","url":"https://github.com/apache/activemq/pull/2080"},{"type":"WEB","url":"https://github.com/apache/activemq/commit/42e2be75eddcece3cddacf8a73e6cad7db5aa626"},{"type":"WEB","url":"https://github.com/apache/activemq/commit/6fc46e520bac7d9763ba5762cc2de603f19ed517"},{"type":"WEB","url":"https://github.com/apache/activemq/commit/e25f9b88898ef7cdfac9e855f4559a1ad0a6da12"},{"type":"PACKAGE","url":"https://github.com/apache/activemq"},{"type":"WEB","url":"https://github.com/apache/activemq/releases/tag/activemq-5.19.8"},{"type":"WEB","url":"https://github.com/apache/activemq/releases/tag/activemq-6.2.7"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-11-04T16:25:46.181028122Z"}}