Input validation error in ActiveMQ - CVE-2026-59878
Published: August 24, 2026
Vulnerability identifier: #VU144756
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-2026-59878
CWE-ID: CWE-20
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 improper input validation in the AMQP NIO connector when processing a crafted frame size value. A remote attacker can send a specially crafted frame to cause a denial of service.
If triggered rapidly enough, the issue can exhaust the NIO thread pool and deny service to other connections.
Affected software
ActiveMQ
openEuler
activemq
activemq-javadoc
openEuler
activemq
activemq-javadoc
How to mitigate CVE-2026-59878
Install security update from vendor's website.
ActiveMQ - addressed in versions 5.19.9, 6.2.8, 6.3.0
activemq - update to 5.19.9-1
activemq-javadoc - update to 5.19.9-1
activemq - update to 5.19.9-1
activemq-javadoc - update to 5.19.9-1