CVE-2026-95845 Moquette unbounded per-session message queues allow memory exhaustion

What is CVE-2026-95845?

CVE-2026-95845 is a high-severity denial of service vulnerability in moquette-io moquette, published on 23 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Moquette is a lightweight Java MQTT broker. Prior to 0.18.1, the broker does not enforce a maximum length for pending per-session message queues. When a fast publisher sends messages to a slow subscriber whose in-flight window is full, queued messages can accumulate without bound in memory or persistent storage. Remote clients can use this condition to exhaust broker resources and cause a denial of service. This issue is fixed in version 0.18.1.

Weakness: CWE-770

Which versions are affected by CVE-2026-95845?

It affects 1 product.

Products include Moquette Moquette.

How do I fix CVE-2026-95845?

No fix has been published for CVE-2026-95845 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2026-95845 being exploited?

There is no known exploitation of CVE-2026-95845 in the wild and no public exploit code.

Other vulnerabilities in moquette-io moquette

• CVE-2026-85724 Moquette pattern ACL wildcard injection allows cross-tenant authorization bypass Critical 9.6
• CVE-2026-95848 Moquette fails open when configured authentication or authorization classes cannot load Critical 9.3
• CVE-2026-95847 Moquette client IDs can cause cross-session H2 durable-queue corruption High 8.8
• CVE-2026-95842 Moquette uncaught MQTT command exceptions can terminate shared session event loops High 8.7
• CVE-2026-95843 Moquette malformed shared subscriptions can crash command processing High 8.7

Sources

• CVE record
• NVD
• OSV
• How this page is made