{"id":"UBUNTU-CVE-2026-50734","details":"Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ Client, Apache ActiveMQ, Apache ActiveMQ All. An 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. This 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. Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.","modified":"2026-07-01T23:43:19.064698943Z","published":"2026-06-30T11:16:00Z","upstream":["CVE-2026-50734"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-50734"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-50734"},{"type":"REPORT","url":"https://lists.apache.org/thread/nxso951fnvf72qf9m475mpz4yf931xk0"}],"affected":[{"package":{"name":"activemq","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.6.0+dfsg1-4+deb8u1ubuntu1","5.6.0+dfsg1-5","5.13.2+dfsg-2","5.13.2+dfsg-2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"5.13.2+dfsg-2ubuntu0.1~esm1","binary_name":"activemq"},{"binary_version":"5.13.2+dfsg-2ubuntu0.1~esm1","binary_name":"libactivemq-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.14.5-3","5.15.2-2","5.15.3-2","5.15.8-2~18.04","5.15.8-2~18.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"activemq","binary_version":"5.15.8-2~18.04.1~esm1"},{"binary_version":"5.15.8-2~18.04.1~esm1","binary_name":"libactivemq-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.15.10-1","5.15.11-1","5.15.11-1ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_name":"activemq","binary_version":"5.15.11-1ubuntu0.1~esm1"},{"binary_version":"5.15.11-1ubuntu0.1~esm1","binary_name":"libactivemq-java"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:Pro:22.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=esm-apps%2Fjammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.16.1-1","5.16.1-1ubuntu0.1~esm1","5.16.1-1ubuntu0.1"],"ecosystem_specific":{"binaries":[{"binary_name":"activemq","binary_version":"5.16.1-1ubuntu0.1"},{"binary_name":"libactivemq-java","binary_version":"5.16.1-1ubuntu0.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.17.2+dfsg-2","5.17.6+dfsg-1"],"ecosystem_specific":{"binaries":[{"binary_name":"activemq","binary_version":"5.17.6+dfsg-1"},{"binary_name":"libactivemq-java","binary_version":"5.17.6+dfsg-1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:25.10","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=questing"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.17.6+dfsg-1","5.17.6+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"5.17.6+dfsg-2","binary_name":"activemq"},{"binary_name":"libactivemq-java","binary_version":"5.17.6+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-50734.json"}},{"package":{"name":"activemq","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/activemq?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.17.6+dfsg-2"],"ecosystem_specific":{"binaries":[{"binary_version":"5.17.6+dfsg-2","binary_name":"activemq"},{"binary_name":"libactivemq-java","binary_version":"5.17.6+dfsg-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-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"},{"type":"Ubuntu","score":"medium"}]}