CVE-2026-21888
High
Description
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductEmqx Nanomq
PublishedMar 11, 2026
First seenMar 11, 2026
Weakness typeCWE-125Out-of-bounds read
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| emqx nanomq | v ≤ 0.24.6 | — |
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