CVE-2026-49363
Apache Artemis: unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by sending a SUBSCRIBE_TOPOLOGY request prior to authentication
CVE-2026-49363: Apache Artemis: unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by sending a…
Compare the source-linked records below. Ratings and product/version details belong to each advisory; they are not a single CVE-wide score or proof that every listed product is affected. How VulniPulse collects and checks evidence.
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CVE-2026-49363 key facts
- CISA KEV
- Not listed (catalog checked )
- Highest advisory severity
- High
- CVSS base score
- 7.5 (Apache), 5.3 (Red Hat)
- CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N(Red Hat)
- Weakness
- CWE-306
- Fixed releases
- Apache: 2.57.0
- Red Hat: 2.57.0, artemis-server, eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap, eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap, eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap, eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap and 40 more in the advisory
- VulniPulse record
- Published · Updated
Scores, vectors, weaknesses and fixed releases are quoted from vendor advisories that cover only CVE-2026-49363; bulletin-wide values are not repeated here.
Is CVE-2026-49363 exploited?
No exploitation is reported in the sources VulniPulse tracks: CVE-2026-49363 is not in the CISA KEV catalog (checked ) and no tracked advisory for it reports exploitation. That is not proof the vulnerability cannot be exploited.
How do I fix CVE-2026-49363?
Upgrade to a fixed release named by the vendor:
- Apache: 2.57.0
- Red Hat: 2.57.0, artemis-server, eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap, eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap, eap8-artemis-wildfly-integration-0:2.0.5-1.Final_redhat_00001.1.el10eap, eap8-bouncycastle-0:1.85.0-1.redhat_00001.1.el10eap
- Users are recommended to upgrade to version 2.57.0, which fixes the issue. (Apache)
- 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. 2. 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. 3. 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. (Red Hat)
Vendor advisory comparison
Apache
1 advisory- Advisory severityHigh7.5
High [CVE-2026-49363] Apache Artemis: unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by sending a SUBSCRIBE_TOPOLOGY request prior to authentication
CVE-2026-49363Source published Source updated
An unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by sending a SUBSCRIBE_TOPOLOGY request prior to authentication. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue.
- Affected products in this advisory
- Apache Artemis
- Source-reported affected versions
- 2.50.0 through 2.56.0
- 1.0.0 through 2.44.0.
- through 2.44.0
- Source-reported fixed versions
- 2.57.0
- Mitigation guidance
- Users are recommended to upgrade to version 2.57.0, which fixes the issue.
Red Hat
1 advisory- Advisory severityMedium5.3
Medium [CVE-2026-49363] Pre-auth topology disclosure via CORE SUBSCRIBE_TOPOLOGY_V2 on channel0
CVE-2026-49363Source published Source updated
An unauthenticated remote attacker connecting with the CORE protocol can discover cluster node details by sending a SUBSCRIBE_TOPOLOGY request prior to authentication. This issue affects Apache Artemis: from 2.50.0 through 2.56.0; Apache ActiveMQ Artemis: from 1.0.0 through 2.44.0. Users are recommended to upgrade to version 2.57.0, which fixes the issue. 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…
- Affected products in this advisory
- Red Hat AMQ Broker 7.13.6
- Red Hat AMQ Broker 7.14.1
- Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 10
- Red Hat JBoss Enterprise Application Platform 8.1 for RHEL 8
3 more entries in the full advisory.
- Source-reported affected versions
- 2.50.0
- 2.56.0
- 1.0.0
- 2.44.0
- Source-reported fixed versions
- 2.57.0
- artemis-server
- eap8-activemq-artemis-0:2.40.0-8.redhat_00024.1.el10eap
- eap8-apache-cxf-0:4.1.7-1.SP1_redhat_00001.1.el10eap
42 more entries in the full advisory.
- Mitigation guidance
- 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. 2. 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. 3. 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.
More Apache advisories
- CVE-2026-49362Sep 10, 2026Apache Artemis: unauthenticated remote attacker can create arbitrary durable queues
- CVE-2026-49364Sep 10, 2026Apache Artemis: unauthenticated network-adjacent attacker can leverage discovery
- CVE-2026-57822Sep 10, 2026Apache Artemis: When the broker is processing message-based management requests, sent
- CVE-2026-57967Sep 10, 2026Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session
- CVE-2026-67593Sep 10, 2026Apache Artemis: remote attacker can craft an Openwire RemoveSubscriptionInfo command
- CVE-2026-75880Sep 10, 2026Apache Artemis, Apache ActiveMQ Artemis: Message selector wildcard handling could lead
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