CVE-2026-21888 PUBLISHED

MQTT v5 Variable Byte Integer parsing out-of-bounds: get_var_integer()

Assigner: GitHub_M
Reserved: 05.01.2026 Published: 11.03.2026 Updated: 11.03.2026

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.

Metrics

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

Product Status

Vendor nanomq
Product nanomq
Versions
  • Version <= 0.24.6 is affected

References

Problem Types

  • CWE-125: Out-of-bounds Read CWE