CVE-2026-21888
MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()
CVSS Score
7.5
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-125 |
| Vendor | nanomq |
| Product | nanomq |
| Published | Mar 11, 2026 |
| Last Updated | Mar 11, 2026 |
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CVSS v3 Breakdown
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
Affected Versions
nanomq / nanomq
<= 0.24.6