CVE-2026-25536

HIGH

7.1

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.

CVE Details

CVSS v3.1 Score7.1

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/4/2026

Last Modified3/18/2026

Sourcenvd

Honeypot Sightings0

Affected Products

lfprojects:mcp_typescript_sdk

Weaknesses (CWE)

CWE-362

References

https://github.com/modelcontextprotocol/typescript-sdk/issues/204(security-advisories@github.com)

https://github.com/modelcontextprotocol/typescript-sdk/issues/243(security-advisories@github.com)

https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7(security-advisories@github.com)

IOC Correlations

No correlations recorded

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