CVE-2026-53917

Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker: Unbounded memory allocation in OpenWire property unmarshalling

State: Published
Severity: 7.5 High
Published: Jun 30, 2026
Updated: Jun 30, 2026
Reserved: Jun 11, 2026

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Description

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker.

An authenticated user can cause a broker DoS by sending a crafted OpenWire Message with a large encoded size value for the map. OpenWire message property maps are unmarshaled without size validation which can trigger OOM and crash the broker. This issue affects Apache ActiveMQ: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ All: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Client: before 5.19.8, from 6.0.0 before 6.2.7; Apache ActiveMQ Broker: before 5.19.8, from 6.0.0 before 6.2.7.

Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue.

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-789 Memory Allocation with Excessive Size Value

Affected Products

Product	Versions
Apache ActiveMQApache Software Foundation	before 5.19.8Affected 6.0.0 to before 6.2.7Affected
Apache ActiveMQ AllApache Software Foundation	before 5.19.8Affected 6.0.0 to before 6.2.7Affected
Apache ActiveMQ ClientApache Software Foundation	before 5.19.8Affected 6.0.0 to before 6.2.7Affected
Apache ActiveMQ BrokerApache Software Foundation	before 5.19.8Affected 6.0.0 to before 6.2.7Affected

References

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