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CVE-2026-95844— Moquette deeply nested MQTT topics can cause stack exhaustion

Quick assessment

Affected
moquette-io moquette
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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 de

CVSS 8.7 · High
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I. Basic Information for CVE-2026-95844

Vulnerability Information

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Vulnerability Title
Moquette deeply nested MQTT topics can cause stack exhaustion
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经控制的递归
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
moquette-io moquette < 0.18.1 -

II. Public POCs for CVE-2026-95844

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III. Intelligence Information for CVE-2026-95844

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Patches & Fixes for CVE-2026-95844 (1)

Other References for CVE-2026-95844 (2)

Same Patch Batch · moquette-io · 2026-09-23 · 8 CVEs total

CVE-2026-85724 9.6 CRITICAL Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass
CVE-2026-95848 9.3 CRITICAL Moquette fails open when configured authentication or authorization classes cannot load
CVE-2026-95847 8.8 HIGH Moquette client IDs can cause cross-session H2 durable-queue corruption
CVE-2026-95846 8.7 HIGH Moquette publishes Last-Will messages without enforcing write authorization
CVE-2026-95843 8.7 HIGH Moquette malformed shared subscriptions can crash command processing
CVE-2026-95845 8.7 HIGH Moquette unbounded per-session message queues allow memory exhaustion
CVE-2026-95842 8.7 HIGH Moquette uncaught MQTT command exceptions can terminate shared session event loops

IV. Related Vulnerabilities

Same product: moquette
Same vendor: moquette-io
Same weakness: CWE-674

V. Comments for CVE-2026-95844

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