CVE-2026-102464 Eclipse Vert.x MQTT - Denial of Service

Eclipse Vert.x MQTT (vertx-mqtt) versions 4.0.0 to 4.5.34, 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contain an unbounded memory growth vulnerability caused by unlimited retention of inbound QoS 2 PUBLISH messages in an internal map, letting a malicious MQTT broker cause denial of service by exhausting memory, exploit requires a malicious or compromised MQTT broker.

CVSS base score 8.2 /10
High
CISA KEV
Not listed
Public exploit
None known
Authentication
Not required
View the NVD record ↗

Details

Type
Denial of Service
Impact
Denial Of Service
CVSS vector
CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
15 October 2026
Updated
15 October 2026
Weakness
CWE-770

Vendor fix

Update to a version later than 5.2.0 or the latest available version where this issue is fixed.

Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them.

References

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