Update @modelcontextprotocol/sdk dependency version #12326
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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.
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cool |
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closing since it needed more changes - track here #12469 |
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Summary
The project includes a vulnerable third-party dependency:
@modelcontextprotocol/sdkversion^1.24.0This version is affected by CVE-2026-25536, a race condition vulnerability (CWE-362) that may lead to cross-session data leakage when server or transport instances are reused across concurrent clients.
Affected File
examples/mcp/package.json
Vulnerability Details
According to the official advisory, versions prior to
1.26.0may not properly isolate request state across concurrent clients if server or transport instances are reused.This may introduce a risk of:
Impact Assessment
If the application:
There is potential for improper isolation between requests, which could result in data from one client being exposed to another.
While I have not confirmed active exploitation in the current implementation, the dependency remains in a version known to contain a high-severity race condition vulnerability.
Recommended Remediation
Upgrade to:
@modelcontextprotocol/sdk >= 1.26.0The issue is resolved starting from version 1.26.0.
References
Thank you for reviewing this report. Please let me know if further validation or testing details are required.
Best regards,