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CVE-2026-95843— Moquette malformed shared subscriptions can crash command processing

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, PostOffice.subscribe parses a shared-subscription filter through SharedSubscriptionUtils.extractShareName before validating the complete $share/{shareName}/{topicFilter} structure. A remote client ca

CVSS 8.7 · High
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I. Basic Information for CVE-2026-95843

Vulnerability Information

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Vulnerability Title
Moquette malformed shared subscriptions can crash command processing
Source: CVE Program / CVE List V5
Vulnerability Description
Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, PostOffice.subscribe parses a shared-subscription filter through SharedSubscriptionUtils.extractShareName before validating the complete $share/{shareName}/{topicFilter} structure. A remote client can send a filter such as $share/grp without a topic-filter portion, causing a StringIndexOutOfBoundsException while calculating the share name. The exception terminates command handling on the shared session event loop and can deny service to other client sessions assigned to that loop. 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
输入验证不恰当
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-2026-95843

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III. Intelligence Information for CVE-2026-95843

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Patches & Fixes for CVE-2026-95843 (2)

Other References for CVE-2026-95843 (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-2026-95845 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-20

V. Comments for CVE-2026-95843

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