# 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.

- **Severity:** High 7.5 (`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Login needed:** Not needed
- **Attackable:** Over the internet
- **Victim action needed:** Not needed
- **Fix available:** Yes
- **Published:** 10 Sep 2026
- **Updated:** 10 Sep 2026
- **Also known as:** GHSA-68p5-g7wf-vrwp

## 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 (Missing Authentication for Critical Functionality)

## Which versions are affected by CVE-2026-49363?

It affects 1 product.


Products: 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](https://insights.sbomify.com/CVE-2026-57967/): Apache Artemis, Apache ActiveMQ Artemis: Missing authentication on CORE protocol session reattachment (critical 9.8)
- [CVE-2026-27446](https://insights.sbomify.com/CVE-2026-27446/): Apache Artemis, Apache ActiveMQ Artemis: Auth bypass for Core downstream federation (critical 9.3)
- [CVE-2026-49364](https://insights.sbomify.com/CVE-2026-49364/): Information disclosure in Apache ActiveMQ Artemis (critical 9.1)
- [CVE-2026-67593](https://insights.sbomify.com/CVE-2026-67593/): Missing authorization in Apache ActiveMQ Artemis (critical 9.1)
- [CVE-2023-50780](https://insights.sbomify.com/CVE-2023-50780/): Apache ActiveMQ Artemis: Authenticated users could perform RCE via Jolokia MBeans (high 8.8)

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-49363 and fix it if it is affected.

What it is: 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.
Exploitation: There is no known exploitation of CVE-2026-49363 in the wild and no public exploit code.

Affected product: Apache ActiveMQ Artemis. No package-level version data is available, so check the vendor advisory linked from the reference page.

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-49363/ (Markdown: https://insights.sbomify.com/CVE-2026-49363/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-49363
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-49363
- OSV: https://osv.dev/vulnerability/CVE-2026-49363

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-49363/
Summaries are generated and may contain mistakes; the official description above is the record.