CVE-2026-95842 moquette-io CVE debrief

Who should care

Defenders responsible for MQTT broker deployments, especially those using Moquette versions prior to 0.18.1, should assess potential exposure and consider upgrading to 0.18.1 or later.

Why it matters

CVE-2026-95842 allows an attacker to disrupt session processing for co-located clients in Moquette MQTT broker deployments, potentially impacting availability and requiring verification of exposure and remediation.

• Disruption of session processing for co-located clients
• Potential impact on MQTT broker deployments

Technical summary

Moquette, a lightweight Java MQTT broker, is vulnerable to disruption of session processing for co-located clients due to an issue with exception handling in SessionEventLoop.run. This issue is fixed in version 0.18.1. The vulnerability allows an attacker to disrupt session processing for co-located clients in Moquette MQTT broker deployments, potentially impacting availability and requiring verification of exposure and remediation. The technical impact includes disruption of session processing for co-located clients, and defenders should prioritize verifying exposure and assessing potential impact on MQTT broker deployments, especially for versions prior to 0.18.1.

Defensive priority

Defenders should prioritize verifying exposure and assessing potential impact on MQTT broker deployments, especially for versions prior to 0.18.1, and consider upgrading to 0.18.1 or later.

Recommended defensive actions

• Verify Moquette version and assess exposure
• Consider upgrading to Moquette version 0.18.1 or later
• Monitor MQTT broker deployments for potential impact
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD detail page provide information on the vulnerability in Moquette, a lightweight Java MQTT broker. The issue is fixed in version 0.18.1. The vulnerability allows an attacker to disrupt session processing for co-located clients in Moquette MQTT broker deployments. The disruption can impact availability and requires verification of exposure and remediation. The CVE record and NVD detail page provide information on the vulnerability, but additional verification is necessary to confirm affected scope and severity.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.