PT-2025-48746 · Unknown · Mcp Typescript Sdk

Published 2025-12-02 · Updated 2026-06-04 · CVE-2025-66414

Positive Technologies (AI Summary)

CVSS v3.1

8.1

High

Base vector

AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N

Name of the Vulnerable Software and Affected Versions MCP TypeScript SDK versions prior to 1.24.0

Description The Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default for HTTP-based servers. If an HTTP-based MCP server is running on localhost without authentication, using StreamableHTTPServerTransport or SSEServerTransport, and DNS rebinding protection is not enabled, a malicious website could exploit DNS rebinding to bypass same-origin policy restrictions. This could allow an attacker to send requests to the local MCP server and potentially invoke tools or access resources exposed by the server on behalf of the user. This issue does not affect servers using stdio transport. Running HTTP-based MCP servers locally without authentication is not recommended.

Recommendations Update to version 1.24.0 or later.

Exploit

Fix

Weakness Enumeration

CWE-350

CWE-1188

Related Identifiers

CVE-2025-66414

GHSA-W48Q-CV73-MX4W

Affected Products

Mcp Typescript Sdk

References · 14

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66414.json · Exploit
• https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-w48q-cv73-mx4w · Vendor Advisory
• https://github.com/modelcontextprotocol/typescript-sdk/commit/09623e2aa5044f9e9da62c73d820a8250b9d97ed · Patch
• https://osv.dev/vulnerability/GHSA-w48q-cv73-mx4w · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-66414 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-66414 · Security Note
• https://osv.dev/vulnerability/ROOT-APP-NPM-CVE-2025-66414 · Vendor Advisory
• https://github.com/modelcontextprotocol/typescript-sdk · Note
• https://github.com/modelcontextprotocol/typescript-sdk/commit/608360047dc6899f1cf4f0226eb62fe7b11b3898 · Note
• https://github.com/modelcontextprotocol/typescript-sdk/pull/1205 · Note
• https://t.me/cveNotify/154960 · Telegram Post
• https://reddit.com/r/VulnMatter/comments/1pchx5n/resumen_diario_de_vulnerabilidades_02122025 · Reddit Post
• https://twitter.com/CVEnew/status/1995929996712427935 · Twitter Post
• https://t.me/CVEtracker/38707 · Telegram Post