{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "4.0.0"
              },
              {
                "last_affected": "4.5.34"
              },
              {
                "introduced": "5.0.0"
              },
              {
                "last_affected": "5.0.12"
              },
              {
                "introduced": "5.1.0"
              },
              {
                "last_affected": "5.1.9"
              },
              {
                "introduced": "5.2.0"
              },
              {
                "last_affected": "5.2.0"
              }
            ],
            "source": "AFFECTED_FIELD"
          },
          "events": [
            {
              "introduced": "9d9d56dc8bcd30e525e177ff462212b11c55dd07"
            },
            {
              "last_affected": "6acce64664eabc086fc0fe1ea0ad9a21a153594c"
            },
            {
              "introduced": "6837af793026a2fba5b6b32e0161fce6d9c8b691"
            },
            {
              "last_affected": "fb40976c228a72763d595bbb8499feabd39166f1"
            },
            {
              "introduced": "1d93c2e48aafcaa38af40154205c7810f66e1cc2"
            },
            {
              "last_affected": "84f06a87043a873160492923154b044c80b16f32"
            },
            {
              "introduced": "3708bdc1d328afce37abd39dba932399a0469742"
            },
            {
              "last_affected": "3708bdc1d328afce37abd39dba932399a0469742"
            }
          ],
          "repo": "https://github.com/eclipse-vertx/vertx-sql-client",
          "type": "GIT"
        }
      ],
      "versions": [
        "5.2.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-9jxp-x3fr-ffqh"
  ],
  "database_specific": {
    "cna_assigner": "eclipse",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102466.json"
  },
  "details": "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.",
  "id": "CVE-2026-102466",
  "modified": "2026-10-17T02:30:51.509932324Z",
  "published": "2026-10-15T08:15:32.883Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/342"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102466.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-9jxp-x3fr-ffqh"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-102466"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "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",
      "type": "CVSS_V4"
    }
  ]
}