Description
Integer Overflow or Wraparound vulnerability in Apache ActiveMQ, Apache ActiveMQ All, Apache ActiveMQ MQTT.
The fix for "CVE-2025-66168: MQTT control packet remaining length field is not properly validated" was only applied to 5.19.2 (and future 5.19.x) releases but was missed for all 6.0.0+ versions.
This issue affects Apache ActiveMQ: from 6.0.0 before 6.2.4; Apache ActiveMQ All: from 6.0.0 before 6.2.4; Apache ActiveMQ MQTT: from 6.0.0 before 6.2.4.
Users are recommended to upgrade to version 6.2.4 or a 5.19.x version starting with 5.19.2 or later (currently latest is 5.19.5), which fixes the issue.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Apache Software Foundation | Apache ActiveMQ | 6.0.0 – < 6.2.4 | 6.2.4 |
| Apache Software Foundation | Apache ActiveMQ All | 6.0.0 – < 6.2.4 | 6.2.4 |
| Apache Software Foundation | Apache ActiveMQ MQTT | 6.0.0 – < 6.2.4 | 6.2.4 |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | activemq | No fix yet | — |
| Ubuntu 26.04 LTS | activemq | No fix yet | — |
| Ubuntu 25.10 | activemq | No fix yet | — |
| Ubuntu 24.04 LTS | activemq | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 20.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 18.04 LTS | activemq | No fix yet | — |
| Ubuntu Pro 16.04 LTS | activemq | No fix yet | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| Maven | org.apache.activemq:activemq-all | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-xvqc-pp94-fmpx |
| Maven | org.apache.activemq:activemq-mqtt | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-xvqc-pp94-fmpx |
| Maven | org.apache.activemq:apache-activemq | >= 6.0.0, < 6.2.4 | 6.2.4 | GHSA-xvqc-pp94-fmpx |
Advisories 2
- WID-SEC-2026-3043 IBM QRadar SIEM: Mehrere Schwachstellen BSI CERT-Bund (WID) · Sep 17, 2026
- WID-SEC-2026-1040 Apache ActiveMQ: Mehrere Schwachstellen BSI CERT-Bund (WID) · Jul 23, 2026