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CVE-2026-25536

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Date: February 4, 2026

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.

Severity Score

Related Resources (6)

https://github.com/modelcontextprotocol/typescript-sdk
https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7
https://github.com/modelcontextprotocol/typescript-sdk/issues/204
https://nvd.nist.gov/vuln/detail/CVE-2026-25536
https://github.com/modelcontextprotocol/typescript-sdk/issues/243
https://www.mend.io/vulnerability-database/CVE-2026-25536

Severity Score

Weakness Type (CWE)

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

CWE-362

Top Fix

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Upgrade Version

Upgrade to version @modelcontextprotocol/sdk - 1.26.0;https://github.com/modelcontextprotocol/typescript-sdk.git - v1.26.0

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CVSS v3.1

Base Score:
Attack Vector (AV): NETWORK
Attack Complexity (AC): LOW
Privileges Required (PR): LOW
User Interaction (UI): NONE
Scope (S): UNCHANGED
Confidentiality (C): HIGH
Integrity (I): LOW
Availability (A): NONE

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