CVE-2026-21888

HIGH

7.5

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.

CVE Details

CVSS v3.1 Score7.5

SeverityHIGH

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

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published3/11/2026

Last Modified3/17/2026

Sourcenvd

Honeypot Sightings0

Affected Products

emqx:nanomq

Weaknesses (CWE)

CWE-125

References

https://github.com/nanomq/nanomq/issues/2192(security-advisories@github.com)

https://github.com/nanomq/nanomq/security/advisories/GHSA-cggc-6m7w-j7x5(security-advisories@github.com)

IOC Correlations

No correlations recorded

This product uses data from the NVD API but is not endorsed or certified by the NVD.