moquette-io Moquette up to 0.18.0 Shared Subscription PostOffice.subscribe input validation

Summaryinfo

A vulnerability, which was classified as problematic, was found in moquette-io Moquette up to 0.18.0. This affects the function PostOffice.subscribe of the component Shared Subscription Handler. Executing a manipulation can lead to input validation. The identification of this vulnerability is CVE-2026-95843. The attack may be launched remotely. There is no exploit available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in moquette-io Moquette up to 0.18.0 and classified as problematic. This vulnerability affects the function PostOffice.subscribe of the component Shared Subscription Handler. The manipulation with an unknown input leads to a input validation vulnerability. The CWE definition for the vulnerability is CWE-20. The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly. As an impact it is known to affect availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability was named CVE-2026-95843 since 09/22/2026. The exploitation appears to be easy. The attack can be initiated remotely. Technical details are known, but there is no available exploit.

Upgrading to version 0.18.1 eliminates this vulnerability.

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Productinfo

Vendor

• moquette-io

Name

• Moquette

Version

• 0.1
• 0.2
• 0.3
• 0.4
• 0.5
• 0.6
• 0.7
• 0.8
• 0.9
• 0.10
• 0.11
• 0.12
• 0.13
• 0.14
• 0.15
• 0.16
• 0.17
• 0.18.0

Website

• Product: https://github.com/moquette-io/moquette/

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