{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "last_affected": "0.9.12"
              },
              {
                "fixed": "0.9.12"
              }
            ],
            "source": [
              "AFFECTED_FIELD",
              "DESCRIPTION"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "ca3fa54c8dc3a020ab554a7289af0927bbbf1f62"
            }
          ],
          "repo": "https://github.com/msgpack/msgpack-java",
          "type": "GIT"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "VulnCheck",
    "cwe_ids": [
      "CWE-190"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90473.json"
  },
  "details": "msgpack-java through 0.9.12 contains an integer overflow vulnerability in MessageUnpacker.skipValue() when processing MAP32 containers with large element counts. Attackers can supply a MAP32 element count at or above 0x40000000 that wraps when doubled, causing the parser cursor to desynchronize and attacker-controlled data to be returned in place of later fields.",
  "id": "CVE-2026-90473",
  "modified": "2026-09-14T03:30:29.444934274Z",
  "published": "2026-09-12T11:06:12.224Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90473.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90473"
    },
    {
      "type": "ADVISORY",
      "url": "https://www.vulncheck.com/advisories/msgpack-java-through-0.9.12-integer-overflow-via-map32"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/msgpack/msgpack-java/issues/1014"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/msgpack/msgpack-java"
    },
    {
      "type": "ARTICLE",
      "url": "https://github.com/msgpack/msgpack-java/blob/v0.9.12/msgpack-core/src/main/java/org/msgpack/core/MessageUnpacker.java#L573-L581"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "msgpack-java through 0.9.12 Integer Overflow via MAP32"
}