CVE-2026-25536

  1. OpenCVE
  2. Vulnerabilities (CVE)
  3. CVE-2026-25536
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.

7.1 /10

CVSS v3 : HIGH

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 4.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact LOW

Availability Impact NONE

Scope UNCHANGED

References
Link Resource
https://github.com/modelcontextprotocol/typescript-sdk/issues/204 Issue Tracking Vendor Advisory
https://github.com/modelcontextprotocol/typescript-sdk/issues/243 Issue Tracking Vendor Advisory
https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7 Mitigation Vendor Advisory
Configurations

Configuration 1 (hide)

cpe:2.3:a:lfprojects:mcp_typescript_sdk:*:*:*:*:*:*:*:*
History

18 Mar 2026, 14:22

Type Values Removed Values Added
CPE cpe:2.3:a:lfprojects:mcp_typescript_sdk:*:*:*:*:*:*:*:*
First Time Lfprojects mcp Typescript Sdk
Lfprojects
References () https://github.com/modelcontextprotocol/typescript-sdk/issues/204 - () https://github.com/modelcontextprotocol/typescript-sdk/issues/204 - Issue Tracking, Vendor Advisory
References () https://github.com/modelcontextprotocol/typescript-sdk/issues/243 - () https://github.com/modelcontextprotocol/typescript-sdk/issues/243 - Issue Tracking, Vendor Advisory
References () https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7 - () https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7 - Mitigation, Vendor Advisory
Summary
  • (es) El SDK de TypeScript de MCP es el SDK oficial de TypeScript para servidores y clientes de Model Context Protocol. Desde la versión 1.10.0 hasta la 1.25.3, se produce una fuga de datos de respuesta entre clientes cuando una única instancia de McpServer/servidor y de transporte es reutilizada a través de múltiples conexiones de cliente, más comúnmente en despliegues de StreamableHTTPServerTransport sin estado. Este problema ha sido parcheado en la versión 1.26.0.

04 Feb 2026, 22:15

Type Values Removed Values Added
New CVE
Information

Published : 2026-02-04 22:15

Updated : 2026-03-18 14:22

NVD link : CVE-2026-25536

Mitre link : CVE-2026-25536

CVE.ORG link : CVE-2026-25536

JSON object : View

Products Affected

lfprojects

  • mcp_typescript_sdk
CWE
CWE-362

Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')