CVE-2026-95844
Received Received - Intake

Stack Overflow in Moquette MQTT Broker

Publication date: 2026-09-23

Last updated on: 2026-09-23

Assigner: GitHub, Inc.

Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, Moquette does not limit the depth of topic names and topic filters before processing them through recursive CTrie insertion and matching operations. A remote client can publish or subscribe with a deeply nested topic, causing a StackOverflowError that disrupts session processing and can deny service to broker clients. This issue is fixed in version 0.18.1.

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Meta Information

Published
2026-09-23
Last Modified
2026-09-23
Generated
2026-09-23
AI Q&A
2026-09-23
EPSS Evaluated
N/A
NVD
CVE-2026-95844
EUVD
EUVD-2026-85414

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
moquette moquette to 0.18.1 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-674 The product does not properly control the amount of recursion that takes place, consuming excessive resources, such as allocated memory or the program stack.

Attack-Flow Graph

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Executive Summary

Moquette is a lightweight Java MQTT broker. Prior to version 0.18.1, it does not limit the depth of topic names or filters. A remote client can publish or subscribe using a deeply nested topic, causing a StackOverflowError that disrupts session processing and denies service to other broker clients.

Detection Guidance

Monitor for MQTT clients attempting to publish or subscribe with deeply nested topics. Check broker logs for warnings about oversized topics or stack overflow errors. Use network monitoring tools to detect unusual MQTT traffic patterns.

Impact Analysis

This vulnerability allows a remote attacker to crash the MQTT broker by sending a deeply nested topic. This causes a denial of service, disrupting all connected clients' sessions and preventing normal broker operations until the issue is resolved.

Mitigation Strategies

Upgrade Moquette to version 0.18.1 or later. Implement network-level monitoring to block or rate-limit MQTT clients sending excessively deep topics. Review and update firewall rules to restrict unauthorized MQTT connections.

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