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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.

PUBLISHED Reserved 2026-01-05 | Published 2026-03-11 | Updated 2026-03-11 | Assigner GitHub_M




HIGH: 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem types

CWE-125: Out-of-bounds Read

Product status

<= 0.24.6
affected

References

github.com/...nanomq/security/advisories/GHSA-cggc-6m7w-j7x5

github.com/nanomq/nanomq/issues/2192

cve.org (CVE-2026-21888)

nvd.nist.gov (CVE-2026-21888)

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