Vulnerability 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.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Lfprojects | Mcp Typescript Sdk | >= 1.10.0, < 1.26.0 |
Related Weaknesses (CWE)
References
- https://github.com/modelcontextprotocol/typescript-sdk/issues/204Issue TrackingVendor Advisory
- https://github.com/modelcontextprotocol/typescript-sdk/issues/243Issue TrackingVendor Advisory
- https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-MitigationVendor Advisory
FAQ
What is CVE-2026-25536?
CVE-2026-25536 is a vulnerability with a CVSS score of 7.1 (HIGH). 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 tran...
How severe is CVE-2026-25536?
CVE-2026-25536 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-25536?
Check the references section above for vendor advisories and patch information. Affected products include: Lfprojects Mcp Typescript Sdk.