AIKIDO-2026-182097
mqtt is vulnerable to Denial of Service (DoS)
85
High Risk
This Affects:
mqttTL;DR
MQTT.js's MQTT 5 packet handlers accepted broker-controlled AUTH, Topic Alias, and SUBACK packets without validating protocol state, causing crashes, session state corruption, and an uncaught TypeError. connect() also mutated the caller's properties object, while QoS 2 messages awaiting PUBREL could accumulate without limit. Six GHSA advisories were fixed in v5.16.0: GHSA-8phv-jwjm-93rr, GHSA-c8jq-r765-cq7g, GHSA-fwrw-4mhv-wxvm, GHSA-gfxc-3w7m-8ch4, GHSA-h8jm-hm87-fqw3, and GHSA-rj8f-4655-cgg2.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and you connect the client to an MQTT broker that is not fully trusted or could be compromised.
Background info
mqtt is vulnerable to Denial of Service (DoS) in versions 0.0.1 - 5.15.2.
How to fix this
Upgrade the mqtt library to the patch version.
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