CVE-2026-21888

HIGH
2026-03-11 [email protected]
7.5
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

2
Analysis Generated
Mar 12, 2026 - 22:06 vuln.today
CVE Published
Mar 11, 2026 - 16:16 nvd
HIGH 7.5

Tags

Information Disclosure Buffer Overflow Nanomq

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.

Analysis

NanoMQ MQTT Broker versions 0.24.6 and earlier are vulnerable to an out-of-bounds read in the MQTT v5 Variable Byte Integer parser, which lacks proper bounds validation when processing 5-byte varints. Remote unauthenticated attackers can trigger a denial of service by sending malformed MQTT packets that crash the broker. …

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Remediation

Within 24 hours: Inventory all NanoMQ deployments and assess exposure in production environments. Within 7 days: Implement network segmentation to restrict MQTT broker access to trusted clients only, and disable MQTT v5 support if MQTT v3.1.1 is sufficient for operations. …

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Priority Score

38
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +38
POC: 0

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CVE-2026-21888 vulnerability details – vuln.today
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