Uncontrolled Memory Allocation in ActiveMQ - CVE-2026-50734

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Main Vulnerability Database Vulnerabilities #VU136621

Uncontrolled Memory Allocation in ActiveMQ - CVE-2026-50734

Published: July 1, 2026


Vulnerability identifier: #VU136621
CSH Severity: Medium
CVSS v4: 8.7 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
CVE-ID: CVE-2026-50734
CWE-ID: CWE-789
Exploitation vector: Remote access
Exploit availability: No public exploit available

Vulnerability details

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to memory allocation with excessive size value in OpenWire wire format negotiation when processing a WireFormatInfo frame during pre-authentication negotiation. A remote attacker can send a crafted WireFormatInfo frame with a malicious large size value to cause a denial of service.

The issue can trigger out-of-memory conditions and crash the broker.


Affected software

ActiveMQ
DataPower Operations Dashboard
Jazz for Service Management
IBM Sterling Secure Proxy
Communications Unified Assurance
openEuler
activemq
activemq-javadoc

How to mitigate CVE-2026-50734

Install security update from vendor's website.

ActiveMQ - addressed in versions 5.19.8, 6.2.7
DataPower Operations Dashboard - update to 1.0.24.0
Jazz for Service Management - update to 1.1.3.27 ifix 0002
IBM Sterling Secure Proxy - update to 6.2.1.3
activemq - update to 5.19.8-1
activemq-javadoc - update to 5.19.8-1

External References

Related Security Bulletins