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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
modelcontextprotocol typescript-sdk
>= 1.10.0, < 1.26.0affected
References
- https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-345p-7cg4-v4c7 ↗
- https://github.com/modelcontextprotocol/typescript-sdk/issues/204 ↗
- https://github.com/modelcontextprotocol/typescript-sdk/issues/243 ↗
- https://access.redhat.com/security/cve/CVE-2026-25536 ↗
- https://bugzilla.redhat.com/show_bug.cgi?id=2436937 ↗
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-25536.json ↗
- https://access.redhat.com/errata/RHSA-2026:3960 ↗