High [CVE-2026-53916] Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: Unbounded header buffer in STOMP NIO codec
This high-severity Red Hat Linux advisory covers CVE-2026-53916 affecting Red Hat AMQ Broker 7.13.6, Red Hat AMQ Broker 7.14.1, Red Hat AMQ Clients.
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Summary
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.
Users are recommended to upgrade to version 6.2.7 or 5.19.8, which fixes the issue. Red Hat products ship Apache ActiveMQ Classic components as transitive dependencies.
The vulnerability is in the Classic ActiveMQ STOMP NIO codec, which does not limit the size of header byte buffering, allowing an unauthenticated attacker to exhaust JVM heap memory. Apache ActiveMQ Artemis, which powers Red Hat AMQ Broker, has its own STOMP protocol implementation (artemis-stomp-protocol) that does not share this code path.
The Classic STOMP NIO codec is not exposed in Red Hat product deployments. Red Hat severity: Important — CVSS 7.5 (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-789.
Affected Red Hat products: Red Hat AMQ Broker 7.13.6; Red Hat AMQ Broker 7.14.1; Red Hat AMQ Broker 7; Red Hat AMQ Clients; Red Hat build of Apache Camel for Spring Boot 4; Red Hat Data Grid 8; Red Hat Enterprise Linux 8; Red Hat Fuse 7; Red Hat JBoss Enterprise Application Platform 7; Red Hat JBoss Enterprise Application Platform 8; Red Hat Satellite 6; Red Hat Single Sign-On 7.
- < 5.19.8
- < 6.0.0
- < 6.2.7
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
- 6.2.7
- 5.19.8
- artemis-stomp-protocol
- RHSA-2026:66545
- RHSA-2026:66488
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
Mitigation checklist
- Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability.
Official advisory · high-confidence parse· fetched 21 days ago·verify at source
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