{"id":"CVE-2026-102464","revision":null,"records":[{"revision":"468847d4377e4674b3cc4d2889dbbc73","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102464","aliases":[],"title":"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 (qos2inb…","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.\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.","state":0,"publishedAt":"2026-10-15T08:26:02.688+00:00","modifiedAt":"2026-10-15T14:19:05+00:00","affected":[{"ecosystem":"Vendor product","name":"Eclipse Vert.x","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"Eclipse Foundation\",\n                    \"product\": \"Eclipse Vert.x\",\n                    \"versions\": [\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"4.0.0\",\n                            \"lessThanOrEqual\": \"4.5.34\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"5.0.0\",\n                            \"lessThanOrEqual\": \"5.0.12\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"5.1.0\",\n                            \"lessThanOrEqual\": \"5.1.9\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"status\": \"affected\",\n                            \"version\": \"5.2.0\",\n                            \"versionType\": \"semver\"\n                        }\n                    ],\n                    \"defaultStatus\": \"unaffected\"\n                }"}],"metrics":[{"system":"CVSS 4.0","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","score":8.2,"severity":"HIGH"}],"references":["https://github.com/vert-x3/vertx-mqtt/security/advisories/GHSA-46xj-5735-6qrp","https://gitlab.eclipse.org/security/cve-assignment/-/work_items/344"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102464","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102464","identifiers":["CVE-2026-102464"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-473bda92d9f145e4a59d46ab39e596a4","complete":false,"records":13655,"lastAttemptAt":"2026-11-09T17:15:31.9295462+00:00","lastSuccessAt":"2026-11-09T17:15:31.925+00:00","error":"8 identifier lookups failed; latest failures include HTTP 403. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-09T17:15:31.925+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13381,"expectedIdentifiers":13707,"failedIdentifiers":8},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-09T17:05:03.6461191+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-09T17:05:03.6461191+00:00","lastSuccessAt":"2026-11-09T17:05:03.8539711+00:00","error":null,"lastVerifiedAt":"2026-11-09T17:05:03.8539712+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. 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