{
 "id": "CVE-2026-25536",
 "description": "MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. From version 1.10.0 to 1.25.3, cross-client response data leak when a single McpServer/Server and transport instance is reused across multiple client connections, most commonly in stateless StreamableHTTPServerTransport deployments. This issue has been patched in version 1.26.0.",
 "published": "2026-02-04",
 "last_modified": "2026-07-15",
 "vuln_status": "Modified",
 "cna": "security-advisories@github.com",
 "cvss": {
  "version": "3.1",
  "score": 7.1,
  "severity": "HIGH",
  "vector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N",
  "source": "security-advisories@github.com"
 },
 "cwe": [
  "CWE-362",
  "CWE-367"
 ],
 "products": [
  {
   "vendor": "lfprojects",
   "product": "mcp_typescript_sdk",
   "versions_affected": ">= 1.10.0 < 1.26.0",
   "fixed_in": "1.26.0",
   "product_id": null
  }
 ],
 "category": "protocol",
 "surface": [
  "exfiltration"
 ],
 "kev": null,
 "fix": {
  "status": "fixed",
  "version": "1.26.0",
  "url": null
 },
 "references": [
  {
   "url": "https://github.com/modelcontextprotocol/typescript-sdk/issues/204",
   "source": "security-advisories@github.com",
   "tags": [
    "Issue Tracking",
    "Vendor Advisory"
   ]
  },
  {
   "url": "https://github.com/modelcontextprotocol/typescript-sdk/issues/243",
   "source": "security-advisories@github.com",
   "tags": [
    "Issue Tracking",
    "Vendor Advisory"
   ]
  },
  {
   "url": "https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7",
   "source": "security-advisories@github.com",
   "tags": [
    "Mitigation",
    "Vendor Advisory"
   ]
  },
  {
   "url": "https://access.redhat.com/errata/RHSA-2026:3960",
   "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
   "tags": []
  },
  {
   "url": "https://access.redhat.com/security/cve/CVE-2026-25536",
   "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
   "tags": []
  },
  {
   "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2436937",
   "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
   "tags": []
  },
  {
   "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25536.json",
   "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
   "tags": []
  }
 ],
 "related_agents": [
  "modelcontextprotocol-python-sdk",
  "modelcontextprotocol-typescript-sdk"
 ],
 "related_incidents": [],
 "match": {
  "tests": [
   "A:name",
   "B:vocabulary"
  ],
  "terms": [
   "mcp-sdk:MCP TypeScript SDK",
   "model context protocol"
  ]
 },
 "status": "candidate",
 "note": null,
 "reviewer": null,
 "checked_on": null,
 "retrieved_on": "2026-10-25"
}