{
  "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-hm2j-xp3c-jff2"
  ],
  "database_specific": {
    "cna_assigner": "eclipse",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103223.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 PostgreSQL message decoder reads the 4-byte message length field from the PostgreSQL wire protocol without any maximum validation. A malicious, compromised, or man-in-the-middle PostgreSQL server can send a message header with the length field set to an extremely large value (up to Integer.MAX_VALUE), causing the decoder to accumulate subsequent TCP data into a composite buffer without bound, leading to unbounded memory allocation on the client and an out-of-memory crash. This occurs before authentication completes.\n\n\n\nThe impacted component is io.vertx:vertx-pg-client.",
  "id": "CVE-2026-103223",
  "modified": "2026-10-17T02:30:35.616285456Z",
  "published": "2026-10-15T08:20:03.749Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://gitlab.eclipse.org/security/cve-assignment/-/work_items/354"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/103xxx/CVE-2026-103223.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/eclipse-vertx/vertx-sql-client/security/advisories/GHSA-hm2j-xp3c-jff2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-103223"
    }
  ],
  "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"
    }
  ]
}