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CVE-2026-25536

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CVE-2026-25536

Published: Feb 4, 2026

Modified: Feb 5, 2026

PUBLISHED

CVSS v3.1

7.1

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.

VendorProductVersions

modelcontextprotocol

typescript-sdk

affected
>= 1.10.0, < 1.26.0

Weaknesses (CWE)

CWE-362

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

Low

Availability

None

References

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