# CVE-2026-49363: Apache Artemis cluster topology disclosure via SUBSCRIBE_TOPOLOGY

Source: https://junglewise.ai/threats/cve-2026-49363-apache-artemis-cluster-topology-disclosure-via-subscribe-topology  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2026-09-10. Updated: 2026-09-26  
License: CC BY 4.0 with a link back

CVE-2026-49363 · Severity: high · CVSS 7.5 · Published 2026-09-10

Apache Artemis is a widely-used message broker that manages enterprise message queues and clustering. An unauthenticated attacker can connect to the broker and send a specially crafted request to discover sensitive information about the cluster's node topology before completing authentication, potentially enabling further attacks on the message broker infrastructure.

Technologies: [Apache Activemq Artemis](https://junglewise.ai/threats/technologies/activemq-artemis), [Apache Artemis](https://junglewise.ai/threats/technologies/artemis). Vendors: [Apache](https://junglewise.ai/threats/vendors/apache).

## Quick answers

**Is CVE-2026-49363 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2026-49363 being exploited in the wild.

**How severe is CVE-2026-49363?** High severity, with a CVSS score of 7.5, published 10 September 2026.

**Which products and versions are affected?** Apache Activemq Artemis 1.0.0 through 2.44.0; Apache Artemis 2.50.0 through 2.56.0.

**Is there a fix for CVE-2026-49363?** A patch was published: Fixed in Apache Artemis version 2.57.0 and later Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

**How is CVE-2026-49363 attacked?** It is attacked over the network.

**Am I affected by CVE-2026-49363?** Check whether you run Apache Activemq Artemis or Apache Artemis at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Technical details

The vulnerability is an information disclosure flaw in the CORE protocol handler of Apache Artemis. An attacker can send a SUBSCRIBE_TOPOLOGY request before completing the authentication handshake, allowing them to enumerate cluster node details without credentials. The attack requires network access to the broker's CORE protocol port and no user interaction. A successful exploit reveals cluster topology information that could facilitate reconnaissance or targeted attacks against the message broker cluster. Patches are available in version 2.57.0 and later.

## Affected products

- Apache Artemis 2.50.0 through 2.56.0
- Apache ActiveMQ Artemis 1.0.0 through 2.44.0

## Timeline

- 2026-09-10: disclosed: CVE-2026-49363 disclosed
- patched: Fixed in Apache Artemis version 2.57.0 and later

## References

- [https://repo.maven.apache.org/maven2](https://repo.maven.apache.org/maven2)
- [https://lists.apache.org/thread/syjch88zw6pfdoso9vs46m23xkgxjbxo](https://lists.apache.org/thread/syjch88zw6pfdoso9vs46m23xkgxjbxo)

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