Apache ActiveMQ Broker: Uncontrolled Resource Consumption
CVE-2026-50750 is a high-severity uncontrolled resource consumption vulnerability in Apache ActiveMQ Broker from Apache, with a CVSS 3.1 base score of 7.5 out of 10. It can be exploited remotely over the network by an unauthenticated attacker, without any action from a user. The record lists versions 5.19.8, 6.2.7 as the first without the flaw, so updating Apache ActiveMQ Broker to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.69% chance of exploitation within 30 days, higher than 53% of scored CVEs.
High severity with no evidence of exploitation so far.
What to do
- Update Apache ActiveMQ Broker to 5.19.8 or 6.2.7, whichever matches your release line, or a later version.
- Update Apache ActiveMQ to 5.19.8 or 6.2.7, whichever matches your release line, or a later version.
- Update Apache ActiveMQ All to 5.19.8 or 6.2.7, whichever matches your release line, or a later version.
- Read the advisory on lists.apache.org for workarounds and exact fixed builds.
- Until you can update, restrict network access to the affected service so it is not reachable from untrusted networks.
Affected products and versions
| Vendor | Product | Affected versions | Fixed in |
|---|---|---|---|
| Apache | Apache ActiveMQ Broker | 5.19.7 up to, but not including, 5.19.8; 6.2.6 up to, but not including, 6.2.7 | 5.19.8, 6.2.7 |
| Apache | Apache ActiveMQ | 5.19.7 up to, but not including, 5.19.8; 6.2.6 up to, but not including, 6.2.7 | 5.19.8, 6.2.7 |
| Apache | Apache ActiveMQ All | 5.19.7 up to, but not including, 5.19.8; 6.2.6 up to, but not including, 6.2.7 | 5.19.8, 6.2.7 |
| Apache | Activemq | 5.19.7; 6.2.6 | Not stated |
| Apache | Activemq Broker | 5.19.7; 6.2.6 | Not stated |
Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.
How the severity score breaks down
- Attack vector
- NetworkCan be exploited remotely over a network, including the internet.
- Attack complexity
- LowNo special conditions are needed; the attack works reliably.
- Privileges required
- NoneNo account or login is needed.
- User interaction
- NoneNo action by a victim is required.
- Scope
- UnchangedImpact stays within the vulnerable component.
- Confidentiality
- NoneNo data is disclosed.
- Integrity
- NoneNothing can be modified.
- Availability
- HighThe component can be taken down completely.
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H. Scored by CISA (ADP).
Official description
Denial of Service via Out of Memory vulnerability in Apache ActiveMQ Broker, Apache ActiveMQ, Apache ActiveMQ All. Following the fix for CVE-2026-49270 an unauthenticated attacker can now cause broker OOM by sending an repeated BrokerInfo commands without sending a ConnectionInfo, until the broker will crash with OOM. This issue affects Apache ActiveMQ Broker: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7; Apache ActiveMQ All: from 5.19.7 before 5.19.8, from 6.2.6 before 6.2.7. Users are recommended to upgrade to version 6.2.7, which fixes the issue.
Source: the CVE record as published by its numbering authority, via NVD and CVE.org.
The underlying weakness: Uncontrolled Resource Consumption
The product does not properly control the allocation and maintenance of a limited resource.
How developers prevent this class of flaw
- Ensure that protocols have specific limits of scale placed on them.
- Ensure that all failures in resource allocation place the system into a safe posture.
More Uncontrolled Resource Consumption vulnerabilities (CWE-400)
Timeline
- CVE record published.
- CISA published its SSVC assessment (exploitation: none, automatable: yes, technical impact: partial).
- Record last changed materially (score, affected products, status or references).
References
Advisories
Other vulnerabilities in Apache ActiveMQ Broker
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
- 8.8 High severity
- 8.1 High severity
Recent Uncontrolled Resource Consumption vulnerabilities
- 7.5 High severity
- 7.5 High severity
- 7.7 High severity
- 7.5 High severity
- 7.5 High severity
- 7.5 High severity
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