{"schemaVersion":3,"id":"CVE-2026-102466","aliases":[],"status":"published","duplicateOf":null,"title":null,"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 Vert.x MySQL client (vertx-mysql-client) pre-allocates an array for column definitions based on a server-declared column count with no upper-bound validation. A malicious or compromised MySQL server, or an attacker with man-in-the-middle positioning, can send a crafted result set packet with an extremely large column count, causing the client to attempt a massive heap allocation. The resulting OutOfMemoryError crashes the Netty event loop thread, causing a complete denial of service for all connections and verticles in the Vert.x application.\n\n\n\nThe impacted component is io.vertx:vertx-mysql-client.","dates":{"published":"2026-10-15T08:15:32.883Z","modified":"2026-10-15T14:24:55.316Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.2,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","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","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.2,"severity":"high","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","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.2,"severity":"high","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","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00258,"percentile":0.16431,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-15T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00258,"percentile":0.16431}],"last30":[{"date":"2026-10-15T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00258,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00258,"percentile":0.16431}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-789","name":"Memory Allocation with Excessive Size Value","description":"The product allocates memory based on an untrusted, large size value, but it does not ensure that the size is within expected limits, allowing arbitrary amounts of memory to be allocated.","type":"weakness","status":"Draft","abstraction":"Variant","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/789.html"}],"affected":[{"vendor":"eclipse foundation","product":"eclipse vert.x","name":"Eclipse Vert.x","label":"eclipse vert.x","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≥ 4.0.0, ≤ 4.5.34","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.0.0, ≤ 5.0.12","noFixRecorded":false,"fixedIn":null},{"text":"≥ 5.1.0, ≤ 5.1.9","noFixRecorded":false,"fixedIn":null},{"text":"5.2.0","noFixRecorded":false,"fixedIn":null}],"versionsText":"≥ 4.0.0, ≤ 4.5.34 | ≥ 5.0.0, ≤ 5.0.12 | ≥ 5.1.0, ≤ 5.1.9 | 5.2.0","eol":null,"hubHref":"/vendor/eclipse_foundation/eclipse_vertx"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh","label":"github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh","hostname":"github.com","tags":[]},{"url":"https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342","label":"gitlab.eclipse.org/security/cve-assignment/-/work_items/342","hostname":"gitlab.eclipse.org","tags":[]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-15T08:15:32.883Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-15T14:24:55.316Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":33,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-19T15:45:54.139Z","stale":false,"partial":false}}