CVE-2026-25536
High
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.
SeverityHigh
CVSS7.1
Exploit probability—
ProductLfprojects Mcp Typescript Sdk
PublishedFeb 4, 2026
First seenFeb 4, 2026
Weakness typeCWE-362Race condition
How to fix
Update
- lfprojects mcp_typescript_sdk1.26.0 or later
- @modelcontextprotocol/sdk1.26.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| lfprojects mcp_typescript_sdk | 1.10.0 ≤ v < 1.26.0 | 1.26.0 |
| @modelcontextprotocol/sdknpm | 1.10.0 ≤ v < 1.26.0 | 1.26.0 |
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