CVE-2026-95845: CWE-770: Allocation of Resources Without Limits or Throttling in moquette-io moquette
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. When a fast publisher sends messages to a slow subscriber whose in-flight window is full, queued messages can accumulate without bound in memory or persistent storage. Remote clients can use this condition to exhaust broker resources and cause a denial of service. This issue is fixed in version 0.18.1.
AI Analysis
Technical Summary
The Moquette MQTT broker before version 0.18.1 does not enforce limits on the length of pending message queues per session. When a fast publisher sends messages faster than a slow subscriber can process, and the subscriber's in-flight window is full, messages accumulate without bound. This lack of throttling or resource allocation limits can be exploited remotely to exhaust broker resources, resulting in denial of service. The vulnerability is identified as CWE-770 (Allocation of Resources Without Limits or Throttling) and has a CVSS 4.0 score of 8.7 (high severity). The issue is resolved in Moquette version 0.18.1.
Potential Impact
Remote attackers can cause denial of service by exhausting broker resources through unbounded accumulation of queued messages. This affects the availability of the Moquette MQTT broker service.
Mitigation Recommendations
Upgrade to Moquette version 0.18.1 or later, where this vulnerability is fixed by enforcing maximum lengths on pending per-session message queues. No other mitigation is required as the fix is official and available.
CVE-2026-95845: CWE-770: Allocation of Resources Without Limits or Throttling in moquette-io moquette
Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. When a fast publisher sends messages to a slow subscriber whose in-flight window is full, queued messages can accumulate without bound in memory or persistent storage. Remote clients can use this condition to exhaust broker resources and cause a denial of service. This issue is fixed in version 0.18.1.
CVSS v4.0
Score 8.7high
Affected software
moquette-io
moquette
pkg:github/moquette-io/moquetteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Moquette MQTT broker before version 0.18.1 does not enforce limits on the length of pending message queues per session. When a fast publisher sends messages faster than a slow subscriber can process, and the subscriber's in-flight window is full, messages accumulate without bound. This lack of throttling or resource allocation limits can be exploited remotely to exhaust broker resources, resulting in denial of service. The vulnerability is identified as CWE-770 (Allocation of Resources Without Limits or Throttling) and has a CVSS 4.0 score of 8.7 (high severity). The issue is resolved in Moquette version 0.18.1.
Potential Impact
Remote attackers can cause denial of service by exhausting broker resources through unbounded accumulation of queued messages. This affects the availability of the Moquette MQTT broker service.
Mitigation Recommendations
Upgrade to Moquette version 0.18.1 or later, where this vulnerability is fixed by enforcing maximum lengths on pending per-session message queues. No other mitigation is required as the fix is official and available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- GitHub_M
- Date Reserved
- 2026-09-22T16:39:45.793Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6ab402daf7a7c541060ee0d3
Added to database: 09/23/2026, 16:48:26 UTC
Last enriched: 09/23/2026, 17:03:39 UTC
Last updated: 09/24/2026, 01:57:04 UTC
Views: 8
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