CVE-2026-102464
Full vulnerability record from the local CVENow database.
Description
In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Eclipse Vert.x MQTT (vertx-mqtt) MqttClient stores every inbound QoS 2 PUBLISH message received from the broker in an internal map (qos2inbound) while awaiting the corresponding PUBREL packet to complete the QoS 2 handshake. This map has no size limit; the maxInflightQueue option is enforced only on the outbound publish path and does not constrain inbound message retention. A malicious or compromised MQTT broker can exploit this by sending QoS 2 PUBLISH messages with distinct packet identifiers and withholding the PUBREL responses. Each incomplete handshake causes the client to retain the full publish message (topic, payload, and metadata) indefinitely, leading to unbounded memory growth in the Vert.x process. This can degrade the MQTT-consuming application or cause out-of-memory termination. The impacted component is io.vertx:vertx-mqtt.
Severity
HIGH
CVSS score
8.2
(v4.0)
Vulnerability status
Analyzed
Source identifier
Published
2026-10-15 09:17:15.283000
Last modified
2026-10-20 19:28:24.840000
View original CVE JSON
{
"id": "CVE-2026-102464",
"sourceIdentifier": "[email protected]",
"published": "2026-10-15T09:17:15.283",
"lastModified": "2026-10-20T19:28:24.840",
"vulnStatus": "Analyzed",
"cveTags": [],
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"lang": "en",
"value": "In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Eclipse Vert.x MQTT (vertx-mqtt) MqttClient stores every inbound QoS 2 PUBLISH message received from the broker in an internal map (qos2inbound) while awaiting the corresponding PUBREL packet to complete the QoS 2 handshake. This map has no size limit; the maxInflightQueue option is enforced only on the outbound publish path and does not constrain inbound message retention.\n\n\n\nA malicious or compromised MQTT broker can exploit this by sending QoS 2 PUBLISH messages with distinct packet identifiers and withholding the PUBREL responses. Each incomplete handshake causes the client to retain the full publish message (topic, payload, and metadata) indefinitely, leading to unbounded memory growth in the Vert.x process. This can degrade the MQTT-consuming application or cause out-of-memory termination.\n\n\n\nThe impacted component is io.vertx:vertx-mqtt."
}
],
"affected": [
{
"source": "[email protected]",
"affectedData": [
{
"vendor": "Eclipse Foundation",
"product": "Eclipse Vert.x",
"defaultStatus": "unaffected",
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"baseSeverity": "HIGH",
"attackVector": "NETWORK",
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"vulnIntegrityImpact": "NONE",
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"subAvailabilityImpact": "NONE",
"exploitMaturity": "NOT_DEFINED",
"confidentialityRequirement": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"availabilityRequirement": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
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"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
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"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"valueDensity": "NOT_DEFINED",
"vulnerabilityResponseEffort": "NOT_DEFINED",
"providerUrgency": "NOT_DEFINED"
}
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"cvssMetricV31": [
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"source": "[email protected]",
"type": "Primary",
"cvssData": {
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"ssvcV203": [
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"id": "CVE-2026-102464",
"options": [
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{
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"configurations": [
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"references": [
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"url": "https://github.com/vert-x3/vertx-mqtt/security/advisories/GHSA-46xj-5735-6qrp",
"source": "[email protected]",
"tags": [
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},
{
"url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/344",
"source": "[email protected]",
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}
]
}