high7.5
CVE-2026-21888
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform.
Impact
NanoMQ MQTT Broker (NanoMQ) is an all-around Edge Messaging Platform. MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer() accepts 5-byte varints without bounds checks; reliably triggers OOB read / crash when built with ASan. This affects 0.24.6 and earlier.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Emqx | Nanomq | through 0.24.6 |