CVE-2026-53916

EUVD-2026-40278

30.06.2026, 11:16

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.

Provider	Type	Base Score	Atk. Vector	Atk. Complexity	Priv. Required	Vector
apache	CNA	7.5 HIGH	NETWORK	LOW	NONE	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Base Score

CVSS 3.x

EPSS Score

Percentile: Unknown

Early Detection

Affected products identified ahead of NVD analysis through intelligence sources.

Vendor	Product	Version	Source
apache	activemq	𝑥 < 5.19.8	CNA
apache	activemq	6.0.0 ≤ 𝑥 < 6.2.7	CNA

Ubuntu Releases

Ubuntu Product

Codename

activemq

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
questing	needs-triage
resolute	needs-triage

Common Weakness Enumeration

CWE-789 - Memory Allocation with Excessive Size Value
The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.

Vulnerability Media Exposure

[GERMAN] Apache ActiveMQ: Mehrere Schwachstellen
Ein Angreifer kann mehrere Schwachstellen in Apache ActiveMQ ausnutzen, um Sicherheitsmaßnahmen zu umgehen, Cross-Site-Scripting-Angriffe durchzuführen oder einen Denial-of-Service-Zustand zu verursachen.
Published: 2026-06-29T22:00:00+00:00

References

https://lists.apache.org/thread/07hjsj88hqgsb7vvg6ttsj56ts9vjs5n

http://www.openwall.com/lists/oss-security/2026/06/29/13