CVE-2026-95843: Moquette

High severity, CVSS 7.5. EPSS: 0.4% chance of exploitation in the next 30 days.

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.

Affected products

• Moquette Moquette: before 0.18.1 (fixed in 0.18.1)

Published 2026-09-23. Last modified 2026-09-25.