CVE-2026-25536
HIGHMCP TypeScript SDK 1.10.0-1.25.3 - Cross-Client Response Data Leak via Shared Transport Instance
Title source: llmDescription
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.
References (3)
Core 3
Core References
Vendor Advisory x_refsource_confirm
https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7
Issue Tracking x_refsource_misc
https://github.com/modelcontextprotocol/typescript-sdk/issues/204
Issue Tracking x_refsource_misc
https://github.com/modelcontextprotocol/typescript-sdk/issues/243
Scores
CVSS v3
7.1
EPSS
0.0024
EPSS Percentile
14.7%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-362
Status
published
Products (3)
lfprojects/mcp_typescript_sdk
1.10.0 - 1.26.0
modelcontextprotocol/sdk
1.10.0 - 1.26.0npm
modelcontextprotocol/typescript-sdk
>= 1.10.0, < 1.26.0
Published
Feb 04, 2026
Tracked Since
Feb 18, 2026