CVE-2026-25536 | THREATINT

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.

PUBLISHED Reserved 2026-02-02 | Published 2026-02-04 | Updated 2026-02-05 | Assigner GitHub_M

HIGH: 7.1CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N

Problem types

CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Product status

>= 1.10.0, < 1.26.0

affected

References

github.com/...pt-sdk/security/advisories/GHSA-345p-7cg4-v4c7

github.com/modelcontextprotocol/typescript-sdk/issues/204

github.com/modelcontextprotocol/typescript-sdk/issues/243

cve.org (CVE-2026-25536)

nvd.nist.gov (CVE-2026-25536)

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