CVE-2025-66414

MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. Prior to 1.24.0, The Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default for HTTP-based servers. When an HTTP-based MCP server is run on localhost without authentication with StreamableHTTPServerTransport or SSEServerTransport and has not enabled enableDnsRebindingProtection, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions and send requests to the local MCP server. This could allow an attacker to invoke tools or access resources exposed by the MCP server on behalf of the user in those limited circumstances. Note that running HTTP-based MCP servers locally without authentication is not recommended per MCP security best practices. This issue does not affect servers using stdio transport. This vulnerability is fixed in 1.24.0.

CVSS

No CVSS.

References

Link	Resource
https://github.com/modelcontextprotocol/typescript-sdk/commit/09623e2aa5044f9e9da62c73d820a8250b9d97ed
https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-w48q-cv73-mx4w

Configurations

No configuration.

History

02 Dec 2025, 19:15

Type	Values Removed	Values Added
New CVE

Information

Published : 2025-12-02 19:15

Updated : 2025-12-02 19:15

NVD link : CVE-2025-66414

Mitre link : CVE-2025-66414

CVE.ORG link : CVE-2025-66414

JSON object : View

Products Affected

No product.

CWE

CWE-1188

Initialization of a Resource with an Insecure Default

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