CVE-2026-53917
Received Received - Intake

Memory Allocation DoS in Apache ActiveMQ

Publication date: 2026-06-30

Last updated on: 2026-06-30

Assigner: Apache Software Foundation

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.

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Meta Information

Published
2026-06-30
Last Modified
2026-06-30
Generated
2026-06-30
AI Q&A
2026-06-30
EPSS Evaluated
N/A
NVD
CVE-2026-53917
EUVD
EUVD-2026-40277

Affected Vendors & Products

Showing 4 associated CPEs
Vendor Product Version / Range
apache activemq to 6.2.7 (exc)
apache activemq_all to 6.2.7 (exc)
apache activemq_client to 6.2.7 (exc)
apache activemq_broker to 6.2.7 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-789 The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

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Executive Summary

This vulnerability is a Memory Allocation with Excessive Size Value issue in Apache ActiveMQ and its related components. An authenticated user can exploit it by sending a specially crafted OpenWire Message that contains a very large encoded size value for a map property.

Because the OpenWire message property maps are unmarshaled without validating the size, this can cause the system to allocate excessive memory, potentially leading to an out-of-memory (OOM) condition and crashing the broker.

Impact Analysis

The primary impact of this vulnerability is a Denial of Service (DoS) condition on the Apache ActiveMQ broker.

An attacker who is authenticated can cause the broker to crash by triggering excessive memory allocation, which disrupts message broker availability and can affect any services relying on it.

Mitigation Strategies

To mitigate this vulnerability, users are recommended to upgrade Apache ActiveMQ to version 6.2.7 or 5.19.8, which contain fixes for this issue.

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