Apache ActiveMQ does not properly validate the remaining length field which may lead to an overflow during the decoding of malformed packets. When this integer overflow occurs, ActiveMQ may incorrectly compute the total Remaining Length and subsequently misinterpret the payload as multiple MQTT control packets which makes the broker susceptible to unexpected behavior when interacting with non-compliant clients. This behavior violates the MQTT v3.1.1 specification, which restricts Remaining Length to a maximum of 4 bytes. The scenario occurs on established connections after the authentication process. Brokers that are not enabling mqtt transport connectors are not impacted.
This issue affects Apache ActiveMQ: before 5.19.2, 6.0.0 to 6.1.8, and 6.2.0
Users are recommended to upgrade to version 5.19.2, 6.1.9, or 6.2.1, which fixes the issue.
References
| Link | Resource |
|---|---|
| https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto | Mailing List Vendor Advisory |
| http://www.openwall.com/lists/oss-security/2026/03/03/5 | Mailing List Third Party Advisory |
Configurations
Configuration 1 (hide)
|
History
05 Mar 2026, 18:21
| Type | Values Removed | Values Added |
|---|---|---|
| References | () https://lists.apache.org/thread/13n8mkrb2jf2y6yyhpgrkmpqcm7djyto - Mailing List, Vendor Advisory | |
| References | () http://www.openwall.com/lists/oss-security/2026/03/03/5 - Mailing List, Third Party Advisory | |
| CPE | cpe:2.3:a:apache:activemq:6.2.0:*:*:*:*:*:*:* cpe:2.3:a:apache:activemq:*:*:*:*:*:*:*:* |
|
| First Time |
Apache activemq
Apache |
04 Mar 2026, 10:16
| Type | Values Removed | Values Added |
|---|---|---|
| References |
|
04 Mar 2026, 09:15
| Type | Values Removed | Values Added |
|---|---|---|
| New CVE |
Information
Published : 2026-03-04 09:15
Updated : 2026-03-10 14:09
NVD link : CVE-2025-66168
Mitre link : CVE-2025-66168
CVE.ORG link : CVE-2025-66168
JSON object : View
Products Affected
apache
- activemq
CWE
CWE-190
Integer Overflow or Wraparound