Vulnerability · Published Jun 30, 2026 · Assigned by apache
CVE-2026-53916Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp: Unbounded header buffer in STOMP NIO codec
High 7.5
In plain English
A high-severity security flaw in Apache ActiveMQ from Apache Software Foundation. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 55% of all known vulnerabilities).
Official 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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:12 | activemq | no fix listed | DEBIAN-CVE-2026-53916 |
| Debian:13 | activemq | no fix listed | DEBIAN-CVE-2026-53916 |
| Ubuntu:24.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-53916 |
| Ubuntu:25.10 | activemq | no fix listed | UBUNTU-CVE-2026-53916 |
| Ubuntu:26.04:LTS | activemq | no fix listed | UBUNTU-CVE-2026-53916 |
| Ubuntu:26.10 | activemq | no fix listed | UBUNTU-CVE-2026-53916 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Apache Software Foundation | Apache ActiveMQ | 0 – before 5.19.86.0.0 – before 6.2.7 |
| Apache Software Foundation | Apache ActiveMQ All | 0 – before 5.19.86.0.0 – before 6.2.7 |
| Apache Software Foundation | Apache ActiveMQ Stomp | 0 – before 5.19.86.0.0 – before 6.2.7 |
Weakness: CWE-789 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H