---
id: "CVE-2026-50750"
kind: "vulnerability"
aliases: ["CVE-2026-50750", "GHSA-9qj4-v6r6-3wmx"]
title: "Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All have a Denial of Service via Out of Memory vulnerability"
severity: "high"
cvss: 7.5
epss: 0.00686
exploited: false
status: "open"
category: "package"
products: [{"name": "org.apache.activemq:activemq-broker", "fixed": ["5.19.8"], "affected": "= 5.19.7", "ecosystem": "maven"}, {"name": "org.apache.activemq:activemq-broker", "fixed": ["6.2.7"], "affected": "= 6.2.6", "ecosystem": "maven"}, {"name": "org.apache.activemq:apache-activemq", "fixed": ["5.19.8"], "affected": "= 5.19.7", "ecosystem": "maven"}, {"name": "org.apache.activemq:apache-activemq", "fixed": ["6.2.7"], "affected": "= 6.2.6", "ecosystem": "maven"}, {"name": "org.apache.activemq:activemq-all", "fixed": ["5.19.8"], "affected": "= 5.19.7", "ecosystem": "maven"}, {"name": "org.apache.activemq:activemq-all", "fixed": ["6.2.7"], "affected": "= 6.2.6", "ecosystem": "maven"}, {"name": "apache activemq", "fixed": [], "affected": "= 5.19.7", "ecosystem": "vendor"}, {"name": "apache activemq", "fixed": [], "affected": "= 6.2.6", "ecosystem": "vendor"}, {"name": "apache activemq broker", "fixed": [], "affected": "= 5.19.7", "ecosystem": "vendor"}, {"name": "apache activemq broker", "fixed": [], "affected": "= 6.2.6", "ecosystem": "vendor"}]
ecosystems: ["maven", "vendor"]
tags: ["activemq", "cwe-400", "java", "messaging", "openwire", "package"]
not_affected_if: ["fixed-version", "internal-only-broker"]
published_at: "2026-06-30T11:16:29+00:00"
first_seen_at: "2026-11-04T16:08:53+00:00"
updated_at: "2026-11-04T16:28:16+00:00"
sources: [{"source": "ghsa", "url": "https://github.com/advisories/GHSA-9qj4-v6r6-3wmx", "first_seen_at": "2026-11-04T16:08:53+00:00"}, {"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-50750", "first_seen_at": "2026-11-04T16:28:16+00:00"}]
---

# Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All have a Denial of Service via Out of Memory vulnerability

Apache ActiveMQ brokers can be crashed by an unauthenticated client that repeatedly sends BrokerInfo commands without a ConnectionInfo, so the broker keeps allocating memory until it runs out. The result is a denial of service for every client that depends on the broker.

_Summary, check and fix written by a model from the sources; labelled as such._

## Affected

- maven:org.apache.activemq:activemq-broker affected = 5.19.7 fixed 5.19.8
- maven:org.apache.activemq:activemq-broker affected = 6.2.6 fixed 6.2.7
- maven:org.apache.activemq:apache-activemq affected = 5.19.7 fixed 5.19.8
- maven:org.apache.activemq:apache-activemq affected = 6.2.6 fixed 6.2.7
- maven:org.apache.activemq:activemq-all affected = 5.19.7 fixed 5.19.8
- maven:org.apache.activemq:activemq-all affected = 6.2.6 fixed 6.2.7
- vendor:apache activemq affected = 5.19.7 fixed ?
- vendor:apache activemq affected = 6.2.6 fixed ?
- vendor:apache activemq broker affected = 5.19.7 fixed ?
- vendor:apache activemq broker affected = 6.2.6 fixed ?

## How to check

- Check the ActiveMQ version in use, for example with `activemq-broker` or the version in the Maven dependency tree, and compare it with the affected ranges.
- Confirm whether the broker's OpenWire transport is reachable from untrusted networks.

## Fix

- Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: move from `5.19.7` to `5.19.8` on the 5.19 line.
- Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All: move from `6.2.6` to `6.2.7` on the 6.2 line.

## Timeline

- 2026-11-04T16:08:53+00:00 ghsa https://github.com/advisories/GHSA-9qj4-v6r6-3wmx
- 2026-11-04T16:28:16+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-50750

## Documents

- [advisory] Vendor advisory: lists.apache.org https://lists.apache.org/thread/nhkmbdym61yp6wwy0dny8w1p46sm87kr
- [fix] Patch: github.com https://github.com/apache/activemq/pull/2083
- [fix] Patch: github.com https://github.com/apache/activemq/commit/685ab0b7a4618abd25be7d64c3355401581b69e5
- [fix] Patch: github.com https://github.com/apache/activemq/commit/80562ea8d327b7f538de1ff7672f158fe2abc4c1
- [fix] Patch: github.com https://github.com/apache/activemq/commit/f3a365e74e85dee6042f324156ace661e0d97f2d
- [fix] Release: github.com https://github.com/apache/activemq/releases/tag/activemq-5.19.8
- [fix] Release: github.com https://github.com/apache/activemq/releases/tag/activemq-6.2.7

## From the sources

Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All.

Following the fix for  CVE-2026-49270 an unauthenticated attacker can now cause broker OOM by sending an repeated BrokerInfo commands without sending a ConnectionInfo, until the broker will crash with OOM.
This issue affects Apache ActiveMQ Broker: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ All: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7.

Users are recommended to upgrade to version 6.2.7, which fixes the issue.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_