Review reviewHigh

CVE-2026-53916

Apache Software Foundation Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp

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.

CVSS: 7.5
EPSS: 0.54%
CISA KEV: Not listed
Published: 2026.06.30

PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV

Exploit probability0.54%

Technical severityCVSS 7.5

Vulnerability overview

Affected product and versions

Product: Apache Software Foundation Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp
Affected versions: 6.0.0, < 5.19.8, >= 6.0.0 < 6.2.7
Fixed versions: 5.19.8, 6.2.7

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide

1
Identify
Confirm that Apache Software Foundation Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ Stomp and an affected version are present.
2
Prioritize
Combine exploitation signals with asset exposure and business criticality.
3
Remediate
Follow the vendor advisory or supported update path and preserve rollback options.
4
Verify
Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE: CWE-789