CVE-2025-66416

Katalog CVE

CVSS 8.1 · High EPSS 0,51%

Kerentanan Initialization of a Resource with an Insecure Default pada lfprojects mcp python sdk. Skor CVSS 3.1 8.1 (High) menurut NVD.

Deskripsi (NVD)

The MCP Python SDK, called `mcp` on PyPI, is a Python implementation of the Model Context Protocol (MCP). Prior to version 1.23.0, tThe Model Context Protocol (MCP) Python 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 using FastMCP with streamable HTTP or SSE transport, and has not configured TransportSecuritySettings, 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 1.23.0.

Rincian

Terbit di NVD

2 Desember 2025

Terakhir diubah

17 Juni 2026

Status NVD

Analyzed

CVSS 3.1

8.1 (High), sumber NVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N · uraikan di kalkulator

Jenis kelemahan (CWE)

CWE-1188: Initialization of a Resource with an Insecure Default

EPSS (30 hari)

0,51% peluang dieksploitasi; lebih tinggi dari 42,0% CVE lain

Produk dan versi terdampak

> Data dari konfigurasi CPE di NVD.

Referensi dan perbaikan

• https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-9h52-p55h-vw2f advisory vendor
• https://github.com/modelcontextprotocol/python-sdk/commit/d3a184119e4479ea6a63590bc41f01dc06e3fa99 patch