gcdRadar
archive/Patch now/AIR-2025-0382
closedclosed 2 Dec 2025Patch now2 Disclosed vulnerabilityAI

CVE-2025-66414: MCP TypeScript SDK lacks default DNS rebinding protection

Model Context Protocol TypeScript SDK

The Model Context Protocol TypeScript SDK does not enable DNS rebinding protection by default for HTTP servers. A malicious website could exploit this to invoke local MCP tools.

disclosed CVENo confirmed exploitation, so this record is tracked as a disclosed vulnerability and not counted as an incident. It moves into the counts if CISA or the vendor confirms exploitation. Why

CVSS
7.6
EPSS
0.01 · top 54% · 2026-11-13
EPSS scores by FIRST
fix status
Fix status unknown
first report
2 Dec 2025
last update
2 Dec 2025
CVE ids
CVE-2025-66414other records

Timeline · 2

  1. 2 Dec 2025CVE-2025-66414: Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
  2. 2 Dec 2025CVE-2025-66414: MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients.

Sources · 2

Advisories and databases

  1. 2025-12-02
    CVE-2025-66414: Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default
    GitHub Advisory Database · github.com/advisories/GHSA-w48q-cv73-mx4w
  2. 2025-12-02
    CVE-2025-66414: MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients.
    NVD · nvd.nist.gov/vuln/detail/CVE-2025-66414

Titles and links belong to their publishers. The summary above is written by gcdRadar in its own words; data is CC BY-SA 4.0.

Classification

lane
Patch now
AI role
Attack on AI
categories
Infrastructure vulnerability
severity
2 · Disclosed vulnerability
fix status
Fix status unknown
targets
Framework / tooling
owasp llm top 10
LLM03:2025 Supply Chain
mitre atlas
no technique for these categories
tags
dns-rebinding
dates
happened 2 Dec 2025 · first reported 2 Dec 2025
origin
GitHub Advisory Database
Vulnerability record from NVD / the GitHub Advisory Database. This product uses the NVD API but is not endorsed or certified by the NVD.
record
confidence 0.95 · created 2026-10-18 07:00Z · updated 2026-10-18 10:04Z

Lane, AI role, categories and severity come from the classifier; the OWASP and ATLAS rows are derived from the categories. How these are assigned

Copy a brief

This record as a short Markdown brief, for a ticket, a chat or a coding agent.

the brief as text
# CVE-2025-66414: MCP TypeScript SDK lacks default DNS rebinding protection

https://gcdradar.vercel.app/incidents/cve-2025-66414-mcp-typescript-sdk-lacks-default-dns-rebindin · AIR-2025-0382 · closed 2025-12-02

- Lane: Patch now
- Severity: 2 (Disclosed vulnerability)
- Fix status: Fix status unknown
- First reported: 2025-12-02
- AI role: Attack on AI
- Products: Model Context Protocol TypeScript SDK
- CVE ids: CVE-2025-66414
- CVSS: 7.6

## Summary

The Model Context Protocol TypeScript SDK does not enable DNS rebinding protection by default for HTTP servers. A malicious website could exploit this to invoke local MCP tools.

## What to do

No action recorded; read the sources below and the vendor's advisory.

## Latest updates

- 2025-12-02: CVE-2025-66414: MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. (https://nvd.nist.gov/vuln/detail/CVE-2025-66414)
- 2025-12-02: CVE-2025-66414: Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default (https://github.com/advisories/GHSA-w48q-cv73-mx4w)

## Sources

- 2025-12-02 GitHub Advisory Database: CVE-2025-66414: Model Context Protocol (MCP) TypeScript SDK does not enable DNS rebinding protection by default https://github.com/advisories/GHSA-w48q-cv73-mx4w
- 2025-12-02 NVD: CVE-2025-66414: MCP TypeScript SDK is the official TypeScript SDK for Model Context Protocol servers and clients. https://nvd.nist.gov/vuln/detail/CVE-2025-66414

Verify against the vendor's advisory before changing production. Data CC BY-SA 4.0, https://gcdradar.vercel.app.

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