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High severity7.5NVD Advisory· Published Mar 11, 2026· Updated Jun 17, 2026

CVE-2026-21888

CVE-2026-21888

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.

Affected products

4
  • Emqx/Nanomq3 versions
    cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:emqx:nanomq:*:*:*:*:*:*:*:*range: <=0.24.6
    • (no CPE)range: <=0.24.6
    • (no CPE)range: <= 0.24.6
  • Emqx/NanoMQ MQTT Brokerllm-create
    Range: <=0.24.6

Patches

Vulnerability mechanics

References

2

News mentions

0

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