https://seclists.org/oss-sec/2026/q2/70: CVE-2026-39304: Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incorct handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM

Published Apr 9, 2026
·
Updated

Affected Software

4 affected components
maven/org.apache.activemq/activemq-client<5.19.4, >=6.0.0<6.2.4
maven/org.apache.activemq/activemq-broker<5.19.4, >=6.0.0<6.2.4
maven/org.apache.activemq/activemq-all<5.19.4, >=6.0.0<6.2.4
maven/org.apache.activemq/apache-activemq<5.19.4, >=6.0.0<6.2.4
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Frequently Asked Questions

1

What is the severity of CVE-2026-39304?

CVE-2026-39304 has been rated as important in severity.

2

What versions are affected by CVE-2026-39304?

CVE-2026-39304 affects Apache ActiveMQ Client and Broker versions before 5.19.4 and several other versions before 6.2.4.

3

How do I fix CVE-2026-39304?

To fix CVE-2026-39304, upgrade to Apache ActiveMQ Client version 5.19.4 or later, and Broker version 5.19.4 or later.

4

What exploit does CVE-2026-39304 enable?

CVE-2026-39304 can be exploited to cause a Denial of Service (DoS) via Out of Memory (OOM) conditions.

5

Is CVE-2026-39304 related to TLSv1.3?

Yes, CVE-2026-39304 involves incorrect handling of TLSv1.3 KeyUpdate.

Company

Resources

Contact

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https://seclists.org/oss-sec/2026/q2/70 - CVE-2026-39304: Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incorct handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM - SecAlerts