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
NIST	Primary	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: 42.99%

Affected Products (NVD)

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

𝑥

= Vulnerable software versions

Debian Releases

Debian Product

Codename

activemq

bookworm	vulnerable
bookworm (security)	vulnerable
bullseye	vulnerable
bullseye (security)	vulnerable
sid	vulnerable
trixie	vulnerable

Ubuntu Releases

Ubuntu Product

Codename

activemq

bionic	needs-triage
focal	needs-triage
jammy	needs-triage
noble	needs-triage
questing	ignored
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.

References

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

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