Vulnerability · Published Jun 30, 2026 · Assigned by apache
CVE-2026-53917Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Client, Apache ActiveMQ Broker: Unbounded memory allocation in OpenWire property unmarshalling
High 7.5
In plain English
A high-severity security flaw in Apache ActiveMQ from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | activemq | no fix listed | DEBIAN-CVE-2026-53917 |
| Debian:13 | activemq | no fix listed | DEBIAN-CVE-2026-53917 |
| Maven | org.apache.activemq:activemq-all | 6.2.7 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:activemq-all | 5.19.8 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:activemq-broker | 6.2.7 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:activemq-broker | 5.19.8 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:activemq-client | 5.19.8 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:activemq-client | 6.2.7 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:apache-activemq | 5.19.8 | GHSA-f77w-px59-cqf5 |
| Maven | org.apache.activemq:apache-activemq | 6.2.7 | GHSA-f77w-px59-cqf5 |
| Ubuntu:24.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-53917 |
| Ubuntu:25.10 | activemq | no fix listed | UBUNTU-CVE-2026-53917 |
| Ubuntu:26.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-53917 |
| Ubuntu:26.10 | activemq | no fix listed | UBUNTU-CVE-2026-53917 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache ActiveMQ | 0 – before 5.19.86.0.0 – before 6.2.7 |
| Apache Software Foundation | Apache ActiveMQ All | 0 – before 5.19.86.0.0 – before 6.2.7 |
| Apache Software Foundation | Apache ActiveMQ Client | 0 – before 5.19.86.0.0 – before 6.2.7 |
| Apache Software Foundation | Apache ActiveMQ Broker | 0 – before 5.19.86.0.0 – before 6.2.7 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H