Vulnerability · Published Sep 23, 2026 · Assigned by GitHub_M
CVE-2026-95845Moquette unbounded per-session message queues allow memory exhaustion
High 8.7
In plain English
A high-severity resource allocation without limits in moquette from moquette-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 36% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Maven | io.moquette:moquette-broker | 0.18.1 | GHSA-5f42-97gr-vfhq |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| moquette-io | moquette | < 0.18.1 |
Weakness: CWE-770 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N