What’s Vulnerable › Vulnerabilities

CVE-2026-49363: Apache Artemis, Apache ActiveMQ Artemis: Pre-Authentication Information Disclosure in CORE Protocol Topology Subscription

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.8% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-10 · updated 2026-09-16
• Weakness: CWE-306

Description

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

• Apache Software Foundation Apache ActiveMQ Artemis: from 1.0.0 before 2.44.0; from 2.50.0 before 2.57.0 — fixed in 2.44.0, 2.57.0

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache ActiveMQ Artemis 2.44.0, 2.57.0. Check the vendor advisory for mitigations.

References

• https://lists.apache.org/thread/syjch88zw6pfdoso9vs46m23xkgxjbxo
• http://www.openwall.com/lists/oss-security/2026/09/10/2

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