Severity: important

Affected versions:

- Apache ActiveMQ (org.apache.activemq:apache-activemq) before 5.19.8 - Apache ActiveMQ (org.apache.activemq:apache-activemq) 6.0.0 before 6.2.7 - Apache ActiveMQ All (org.apache.activemq:activemq-all) before 5.19.8 - Apache ActiveMQ All (org.apache.activemq:activemq-all) 6.0.0 before 6.2.7 - Apache ActiveMQ Stomp (org.apache.activemq:activemq-stomp) before 5.19.8 - Apache ActiveMQ Stomp (org.apache.activemq:activemq-stomp) 6.0.0 before 6.2.7

Description:

Memory Allocation with Excessive Size Value vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp.

An unauthenticated client that opens a STOMP NIO connection can send header bytes that never terminate which makes the broker buffer them without limit, exhausting the JVM heap. 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 Stomp: 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.

Credit:

tonghuaroot (finder)

References:

https://activemq.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-53916

Severity: important

Affected versions:

- Apache ActiveMQ (org.apache.activemq:apache-activemq) before 5.19.8 - Apache ActiveMQ (org.apache.activemq:apache-activemq) 6.0.0 before 6.2.7 - Apache ActiveMQ All (org.apache.activemq:activemq-all) before 5.19.8 - Apache ActiveMQ All (org.apache.activemq:activemq-all) 6.0.0 before 6.2.7 - Apache ActiveMQ Stomp (org.apache.activemq:activemq-stomp) before 5.19.8 - Apache ActiveMQ Stomp (org.apache.activemq:activemq-stomp) 6.0.0 before 6.2.7

Description:

Improper Input Validation vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp.

A remote unauthenticated peer that can reach an exposed STOMP connector can trigger denial-of-service behavior by sending a negative content-length. For the NIO STOMP transport, an attacker can keep streaming body bytes and grow the per-connection command buffer beyond configured limits to cause OOM. For the blocking STOMP protocol, an error will instead force abnormal transport exception handling for the affected connection and closure. 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 Stomp: 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.

Credit:

Youngjoon Kim (finder)

References:

https://activemq.apache.org/ https://www.cve.org/CVERecord?id=CVE-2026-49432