AIKIDO-2026-876667
vertx-mqtt is vulnerable to Denial of Service (DoS)
59
CVE Score
Medium
Denial of Service (DoS)
TL;DR
MqttClient in vertx-mqtt keeps every inbound QoS 2 PUBLISH in qos2inbound until PUBREL arrives, and maxInflightQueue applies only to outbound publishes. A broker can send many QoS 2 publishes with distinct packet ids and withhold PUBREL until the client runs out of memory. The fix caps that inbound map.
How do I fix this?
Upgrade the io.vertx:vertx-mqtt library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and the client connects to an MQTT broker you do not trust.
Package
Versions
4.0.0 - 4.5.34
Fixed in 4.5.355.0.0 - 5.1.8
Fixed in 5.1.105.2.0 - 5.2.0
Fixed in 5.2.1Background info
vertx-mqtt is vulnerable to Denial of Service (DoS) in versions 4.0.0 - 4.5.34, 5.0.0 - 5.1.8 and 5.2.0 - 5.2.0.
Links
Get secure today,
quickly and for free.
Secure your code, cloud, and runtime in one central system. Connect a repo to discover what the reasoning agents find in your codebase.
No credit card required | Scan results in 32 seconds.
I consent to receiving marketing communications based on Aikido’s Privacy Policy.
SOC 2Compliant
ISO 27001CompliantISO 42001Compliant
FedRAMPAuthorized© All Intel data is openly available and commercially licensed.