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
Jazz for Service Management
openEuler
activemq
activemq-javadoc
Jazz for Service Management
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
Jazz for Service Management - update to 1.1.3.27 ifix 0002
activemq - update to 5.19.8-1
activemq-javadoc - update to 5.19.8-1
Jazz for Service Management - update to 1.1.3.27 ifix 0002
activemq - update to 5.19.8-1
activemq-javadoc - update to 5.19.8-1