CVE-2026-49363 Information disclosure in Apache ActiveMQ Artemis
Unauthenticated attackers can discover cluster node details via CORE protocol topology requests before authentication, exposing internal network information.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-49363?
CVE-2026-49363 is a high-severity vulnerability in Apache ActiveMQ Artemis, published on 10 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-306
Which versions are affected by CVE-2026-49363?
It affects 1 product.
Products include Apache Artemis.
How do I fix CVE-2026-49363?
Upgrade to a fixed version.
Is CVE-2026-49363 being exploited?
There is no known exploitation of CVE-2026-49363 in the wild and no public exploit code.
Other vulnerabilities in Apache ActiveMQ Artemis
- CVE-2026-57967 Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment
- CVE-2026-27446 Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation
- CVE-2026-49364 Information disclosure in Apache ActiveMQ Artemis
- CVE-2026-67593 Missing authorization in Apache ActiveMQ Artemis
- CVE-2023-50780 Apache ActiveMQ Artemis: Authenticated users could perform RCE via Jolokia MBeans
Sources
Also known as GHSA-68p5-g7wf-vrwp.