{"schema_version":"1.7.5","id":"BIT-activemq-2026-50734","published":"2026-07-06T05:47:13.281Z","modified":"2026-07-06T08:00:06.277042959Z","aliases":["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.","affected":[{"package":{"name":"activemq","ecosystem":"Bitnami","purl":"pkg:bitnami/activemq"},"ranges":[{"type":"SEMVER","events":[{"introduced":"0"},{"fixed":"5.19.8"},{"introduced":"6.0.0"},{"fixed":"6.2.7"}]}],"database_specific":{"source":"https://github.com/bitnami/vulndb/tree/main/data/activemq/BIT-activemq-2026-50734.json"},"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"}]}],"references":[{"type":"WEB","url":"http://www.openwall.com/lists/oss-security/2026/06/29/10"},{"type":"WEB","url":"https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0"},{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-50734"}],"database_specific":{"cpes":["cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:*"],"severity":"High"}}