CVE-2026-39304

CWE-400 — Uncontrolled Resource ConsumptionCWE-770 — Allocation without Limits6 documents5 sources
Severity
7.5HIGH
EPSS
0.0%
top 87.91%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
4
Apache Software Foundation Apache ActivemqApache Software Foundation Apache Activemq ALLApache Software Foundation Apache Activemq Broker+1 more
Timeline
PublishedApr 10

Description

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 possible for a client to rapidly trigger updates which causes the broker to exhaust all its memory in the SSL engine leading to DoS. Note: TLS versions before TLSv1.3 (such as TLSv1.2) are broken but are not vulnerable to OOM. Previous TLS versions require a full…

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:HExploitability: 3.9 | Impact: 3.6

Affected Packages8 packages

▶Mavenorg.apache.activemq:activemq-broker6.0.0 — 6.2.4+1
▶Mavenorg.apache.activemq:activemq-client6.0.0 — 6.2.4+1
▶Mavenorg.apache.activemq:activemq-all6.0.0 — 6.2.4+1

🔴Vulnerability Details

2
CVEList
Apache ActiveMQ Client, Apache ActiveMQ Broker, Apache ActiveMQ All, Apache ActiveMQ: Incorrect handling of TLSv1.3 KeyUpdate can be exploited to cause DoS via OOM↗2026-04-10
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GHSA
Apache ActiveMQ: Denial of Service via Out of Memory vulnerability↗2026-04-10
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📋Vendor Advisories

1
Red Hat
Apache ActiveMQ Client: Apache ActiveMQ Broker: Apache ActiveMQ: Apache ActiveMQ: Denial of Service due to TLSv1.3 KeyUpdate memory exhaustion↗2026-04-10
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💬Community

2
Bugzilla
CVE-2026-39304 log4j: Apache ActiveMQ: Denial of Service due to TLSv1.3 KeyUpdate memory exhaustion [fedora-all]↗2026-04-10
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Bugzilla
CVE-2026-39304 Apache ActiveMQ Client: Apache ActiveMQ Broker: Apache ActiveMQ: Apache ActiveMQ: Denial of Service due to TLSv1.3 KeyUpdate memory exhaustion↗2026-04-10
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