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CVE-2026-25536— @modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse

Quick assessment

Affected
modelcontextprotocol typescript-sdk
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

MCP TypeScript SDK是Model Context Protocol开源的一个用于模型上下文协议服务器和客户端的开发者工具包。 MCP TypeScript SDK 1.10.0版本至1.25.3版本存在竞争条件问题漏洞，该漏洞源于跨客户端响应数据泄露。

CVSS 7.1 · High EPSS 0.38% · P30

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 1

VendorProduct Version RangeStatus
modelcontextprotocol typescript-sdk >= 1.10.0, < 1.26.0 affected
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I. Basic Information for CVE-2026-25536

Vulnerability Information
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Vulnerability Title
@modelcontextprotocol/sdk has cross-client data leak via shared server/transport instance reuse
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用共享资源的并发执行不恰当同步问题(竞争条件)
Source: CVE Program / CVE List V5
Vulnerability Title
MCP TypeScript SDK 竞争条件问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MCP TypeScript SDK是Model Context Protocol开源的一个用于模型上下文协议服务器和客户端的开发者工具包。 MCP TypeScript SDK 1.10.0版本至1.25.3版本存在竞争条件问题漏洞，该漏洞源于跨客户端响应数据泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
modelcontextprotocol typescript-sdk >= 1.10.0, < 1.26.0 -

II. Public POCs for CVE-2026-25536

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III. Intelligence Information for CVE-2026-25536

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Vendor Advisories for CVE-2026-25536 (1)

IV. Related Vulnerabilities

Same product: typescript-sdk
Same vendor: modelcontextprotocol
Same weakness: CWE-362

V. Comments for CVE-2026-25536

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