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CVE-2026-95847— Moquette client IDs can cause cross-session H2 durable-queue corruption

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, H2PersistentQueue derives a session's message-map name as queue_ plus the client ID and its metadata-map name as queue_ plus the client ID plus _meta. A durable session whose client ID ends in _meta

CVSS 8.8 · High

Affected Version Matrix 1

VendorProduct Version RangeStatus
moquette-io moquette < 0.18.1 affected
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I. Basic Information for CVE-2026-95847

Vulnerability Information
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Vulnerability Title
Moquette client IDs can cause cross-session H2 durable-queue corruption
Source: CVE Program / CVE List V5
Vulnerability Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, H2PersistentQueue derives a session's message-map name as queue_ plus the client ID and its metadata-map name as queue_ plus the client ID plus _meta. A durable session whose client ID ends in _meta can therefore make its message map collide with another client's metadata map. The colliding sessions read and write the same H2 MVStore map with incompatible value types, which can corrupt queue head and tail data and cause message loss, misdelivery, failed queue reloads, or exposure of queued content across sessions. 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:H/VA:L/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对资源描述符的控制不恰当(资源注入)
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-2026-95847

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III. Intelligence Information for CVE-2026-95847

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Patches & Fixes for CVE-2026-95847 (2)

Other References for CVE-2026-95847 (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-2026-95846 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
CVE-2026-95844 8.7 HIGH Moquette deeply nested MQTT topics can cause stack exhaustion

IV. Related Vulnerabilities

Same product: moquette
Same vendor: moquette-io
Same weakness: CWE-99

V. Comments for CVE-2026-95847

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