CVE-2026-42588 Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Remote Code Execution via Jolokia addNetworkConnector

What is CVE-2026-42588?

CVE-2026-42588 is a high-severity code injection vulnerability in Apache Activemq, published on 1 Jun 2026. Any signed-in user can exploit it over the network, with no action from the victim.

Official description

Improper Input Validation, Improper Control of Generation of Code ('Code Injection') vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ.

Apache ActiveMQ Classic exposes the Jolokia JMX-HTTP bridge at /api/jolokia/ on the web console. The default Jolokia access policy permits exec operations on all ActiveMQ MBeans (org.apache.activemq:*), including BrokerService.addNetworkConnector(String).

An authenticated attacker can invoke these operations with a crafted discovery URI that triggers the VM transport's brokerConfig parameter using the "masterslave:// " URL which can allow loading a Spring XML application context using ResourceXmlApplicationContext. Because Spring's ResourceXmlApplicationContext instantiates all singleton beans before the BrokerService validates the configuration, arbitrary code execution occurs on the broker's JVM through bean factory methods such as Runtime.exec(). This issue affects Apache ActiveMQ Broker: before 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ All: before 5.19.7, from 6.0.0 before 6.2.6; Apache ActiveMQ: before 5.19.7, from 6.0.0 before 6.2.6.

Users are recommended to upgrade to version 5.19.7 or 6.2.6, which fixes the issue.

Weakness: CWE-94, CWE-20

Which versions are affected by CVE-2026-42588?

13 open source packages ship an affected version, including org.apache.activemq:activemq-all, activemq and org.apache.activemq:activemq-broker. It affects 2 products.

Products include Apache Activemq, Apache Activemq Broker.

How do I fix CVE-2026-42588?

Upgrade org.apache.activemq:activemq-all to a fixed version for your release line: 5.19.7 or 6.2.6.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2026-42588 being exploited?

There is no known exploitation of CVE-2026-42588 in the wild and no public exploit code.

Public exploit code: 2 proofs of concept on GitHub.

Other vulnerabilities in Apache Activemq

• CVE-2023-46604 Apache ActiveMQ Deserialization of Untrusted Data Exploited Critical 10.0
• CVE-2016-3088 Apache ActiveMQ Improper Input Validation Exploited Critical 9.8
• CVE-2026-34197 Apache ActiveMQ Improper Input Validation Exploited High 8.8
• CVE-2020-11998 Remote code execution in Apache ActiveMQ Critical 9.8
• CVE-2013-7285 Command Injection in Xstream Critical 9.8

All Apache Activemq vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BIT-activemq-2026-42588, DEBIAN-CVE-2026-42588, GHSA-hg6c-8mvr-jqc9, MINI-3445-g9vq-rg27, MINI-4x32-cwgf-7xqp, MINI-hj6f-cv7f-j8w5 and 3 more.