High severity · published Sep 23, 2026
CVE-2026-95843
Moquette malformed shared subscriptions can crash command processing
7.5
CVSS
0.4%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
None
Integrity
None
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.4% · higher than 37% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
MO
moquette · moquette-io
< 0.18.1 · source: vendor, NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-95843
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-95843
Patch
https://github.com/moquette-io/moquette/commit/affdc71fdba92dc020421678970ae70518fb6da2
Patch
https://github.com/moquette-io/moquette/pull/962
Release Notes
https://github.com/moquette-io/moquette/releases/tag/v0.18.1
Exploit
https://github.com/moquette-io/moquette/security/advisories/GHSA-5f42-97gr-vfhq
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