{
  "affected": [
    {
      "ranges": [
        {
          "database_specific": {
            "cpe": [
              "cpe:2.3:a:lfprojects:mcp_java_sdk:*:*:*:*:*:*:*:*",
              "cpe:2.3:a:lfprojects:mcp_java_sdk:1.1.0:*:*:*:*:*:*:*"
            ],
            "extracted_events": [
              {
                "introduced": "0"
              },
              {
                "fixed": "1.0.1"
              },
              {
                "introduced": "1.1.0"
              },
              {
                "last_affected": "1.1.0"
              }
            ],
            "source": [
              "CPE_RANGE",
              "CPE_STRING"
            ]
          },
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "d187d09dd58ae9349380a57a23c3636dd78e29e1"
            },
            {
              "introduced": "d4d8072693a8ad98f6d9731dfd4cdbb307fa9bf1"
            },
            {
              "last_affected": "d4d8072693a8ad98f6d9731dfd4cdbb307fa9bf1"
            }
          ],
          "repo": "https://github.com/modelcontextprotocol/java-sdk",
          "type": "GIT"
        }
      ],
      "versions": [
        "1.1.0"
      ]
    }
  ],
  "aliases": [
    "GHSA-hv2w-8mjj-jw22"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-942"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34237.json"
  },
  "details": "MCP Java SDK is the official Java SDK for Model Context Protocol servers and clients. Prior to versions 0.83.0, 1.0.1, and 1.1.1, there is a hardcoded wildcard CORS vulnerability. This issue has been patched in versions 0.83.0, 1.0.1, and 1.1.1.",
  "id": "CVE-2026-34237",
  "modified": "2026-07-15T01:49:05.797150941Z",
  "published": "2026-03-31T15:40:01.070Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletSseServerTransportProvider.java#L289"
    },
    {
      "type": "WEB",
      "url": "https://github.com/modelcontextprotocol/java-sdk/blob/main/mcp-core/src/main/java/io/modelcontextprotocol/server/transport/HttpServletStreamableServerTransportProvider.java#L525"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/34xxx/CVE-2026-34237.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/modelcontextprotocol/java-sdk/security/advisories/GHSA-hv2w-8mjj-jw22"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-34237"
    }
  ],
  "schema_version": "1.8.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "MCP Java SDK has a Hardcoded Wildcard CORS (Access-Control-Allow-Origin: *)"
}