Resource exhaustion in Apache Activemq
CVE-2026-39304
Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ. ActiveMQ NIO SSL transports do not correctly handle TLSv1.3 handshake KeyUpdates triggered by clients. This makes it pos…
Vulnerability class: DoS (Denial of Service)
EPSS: 0.001 (17.8th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Apache Activemq
- Apache Activemq_broker
- Apache Software Foundation Activemq — versions 0, 6.0.0
- Apache Software Foundation Activemq All — versions 0, 6.0.0
- Apache Software Foundation Activemq Broker — versions 0, 6.0.0
- Apache Software Foundation Activemq Client — versions 0, 6.0.0
Weakness classification (CWE)
References
- security@apache.org (vendor-advisory, Vendor Advisory)
- af854a3a-2127-422b-91ae-364da2661108 (Mailing List, Third Party Advisory)
Frequently asked questions
- What is CVE-2026-39304?
- CVE-2026-39304 is a high-severity vulnerability in Apache Activemq, classified under Uncontrolled Resource Consumption. CVSS score: 7.5/10. Published 2026-04-10.
- How severe is CVE-2026-39304?
- High severity. CVSS v3 base score is 7.5 out of 10.