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High severityNVD Advisory· Published Feb 4, 2026· Updated Feb 5, 2026

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

CVE-2026-25536

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.

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Affected packages

Versions sourced from the GitHub Security Advisory.

PackageAffected versionsPatched versions
@modelcontextprotocol/sdknpm
>= 1.10.0, < 1.26.01.26.0

Affected products

16

Patches

Vulnerability mechanics

References

5

News mentions

0

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