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{"bugzilla": {"description": "artemis-server: artemis-server: Pre-auth topology disclosure via CORE SUBSCRIBE_TOPOLOGY_V2 on channel0", "id": "2492627", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2492627"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-306", "details": ["A missing authentication vulnerability was found in Apache ActiveMQ Artemis. The SUBSCRIBE_TOPOLOGY_V2 handler in CoreProtocolManager.LocalChannelHandler.handlePacket() processes topology subscription requests on channel0 with zero authentication -- no call to getSecurityStore(), no credential verification, no subject validation. An unauthenticated attacker can send a single 5-byte packet on the CORE protocol (via :8080 HTTP-upgrade in EAP or :61616 in AMQ Broker) to obtain the broker's nodeID (type-1 UUID embedding MAC address), internal hostname/IP, port numbers, connector configurations, and backup/scale-down group names. In clustered deployments, a persistent ClusterTopologyListener is registered that continuously pushes all topology changes to the unauthenticated client. This contrasts with the federation handler in the same file which was fixed via ARTEMIS-5928 (CVE-2026-27446). The leaked nodeID UUID seed directly enables session-name brute-force for REATTACH_SESSION session hijack."], "mitigation": {"lang": "en:us", "value": "1. Remove Core protocol from internet-facing acceptors -- configure the protocols parameter to exclude Core protocol on any acceptor receiving untrusted connections. In EAP, the :8080 HTTP-upgrade acceptor supports Core by default; restricting to AMQP/STOMP/OpenWire prevents the attack entirely.\n2. Enable mutual TLS -- configure sslEnabled=true with needClientAuth=true on all Core protocol acceptors. TLS handshake failure occurs before any protocol-level packet can be sent.\n3. Disable HTTP-upgrade for Core protocol if not required -- remove the http-upgrade element from the Artemis acceptor configuration to eliminate the :8080 attack surface."}, "name": "CVE-2026-49363", "package_state": [{"cpe": "cpe:/a:redhat:amq_broker:7", "fix_state": "Affected", "package_name": "artemis-server", "product_name": "Red Hat AMQ Broker 7"}, {"cpe": "cpe:/a:redhat:camel_spring_boot:4", "fix_state": "Not affected", "package_name": "artemis-server", "product_name": "Red Hat build of Apache Camel for Spring Boot 4"}, {"cpe": "cpe:/a:redhat:jboss_fuse:7", "fix_state": "Not affected", "package_name": "artemis-server", "product_name": "Red Hat Fuse 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:7", "fix_state": "Fix deferred", "package_name": "artemis-server", "product_name": "Red Hat JBoss Enterprise Application Platform 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_application_platform:8", "fix_state": "Fix deferred", "package_name": "artemis-server", "product_name": "Red Hat JBoss Enterprise Application Platform 8"}, {"cpe": "cpe:/a:redhat:jbosseapxp", "fix_state": "Fix deferred", "package_name": "artemis-server", "product_name": "Red Hat JBoss Enterprise Application Platform Expansion Pack"}], "public_date": "2026-09-10T05:46:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-49363\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-49363"], "threat_severity": "Moderate"}