CVE-2025-66414
DNS Rebinding Protection Disabled by Default in Model Context Protocol TypeScript SDK for Servers Running on Localhost
Description
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.
INFO
Published Date :
Dec. 2, 2025, 7:15 p.m.
Last Modified :
June 17, 2026, 9:56 a.m.
Remotely Exploit :
Yes !
Source :
[email protected]
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | [email protected] | ||||
| CVSS 4.0 | HIGH | [email protected] |
Solution
- Update MCP TypeScript SDK to version 1.24.0.
- Enable DNS rebinding protection.
- Configure authentication for servers.
- Avoid using HTTP transport locally without authentication.
Public PoC/Exploit Available at Github
CVE-2025-66414 has a 17 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2025-66414.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2025-66414 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2025-66414
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
MCP server + Cloudflare Worker for reading public GitHub Projects (v2) boards without authentication
JavaScript TypeScript
Fork of https://github.com/fauguste/boondmanager-mcp-server to add new tools
Dockerfile JavaScript TypeScript
Supply-chain security scanner for the Model Context Protocol (MCP) ecosystem
TypeScript JavaScript
None
TypeScript JavaScript
BoondManager MCP Oauth
Dockerfile JavaScript TypeScript
Production security middleware for MCP servers - DNS rebinding protection, CORS guard, tool filtering
Python TypeScript
Collaborative version control VS Code extension with dependency-aware conflict detection
TypeScript JavaScript Dockerfile HTML CSS
Local mirror of AI-dev-tool changelogs (Anthropic, Cursor, Aider, Continue, MCP SDKs, etc.) with hybrid FTS5 + sqlite-vec retrieval, MCP server, curated cross-product synergies, and a fine-tuned changelog→action synthesizer (cs-actions:v1).
agent-sdk anthropic changelog claude fts5 mcp semantic-search sqlite dataset fine-tuning lora ollama qwen
JavaScript TypeScript Astro CSS Shell Python
TypeScript CLI + MCP server implementing OpenDeepThink (Zhou et al., arXiv:2605.15177). Independent reimplementation; not a fork.
agent bradley-terry cli deepseek llm mcp model-context-protocol pairwise-comparison reasoning test-time-compute typescript opendeepthink
TypeScript JavaScript
The Project shares all information on MCP related CVE's published
mcp mcp-security mcp-cve
Static scanner for MCP-connected AI agent pipelines — 225 rules across 11 categories, 12 compliance frameworks, OWASP Agentic 10/10 + MCP 10/10, GitHub Action, SARIF, public CVE-to-rule ledger.
ai-agent ai-security claude-code github-action mcp mcp-security owasp sarif scanner security supply-chain-security tool-poisoning ai-agent-security ai-safety security-scanner static-analysis
Python Dockerfile Shell TypeScript HTML Makefile
None
Rust Python
Everything you need to start working with AI-powered development tools, installed in the right order with one command per step.
Shell
mcp server for boondmanager
boondmanager mcp-server agentic-ai
TypeScript JavaScript Dockerfile
🗺️ MCP-first infrastructure & agentic-AI cartography — a read-only Model Context Protocol server that gives any AI agent (Claude, OpenAI, Ollama…) awareness of your full system landscape: local services, databases, SaaS tools & their dependencies. Deterministic discovery, recursive traversal & semantic search.
asset-inventory cartography dependency-graph infrastructure mcp network-topology observability shadow-it
TypeScript JavaScript
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2025-66414 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2025-66414 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by [email protected]
Jun. 17, 2026
Action Type Old Value New Value Added Affected [{'vendor': 'modelcontextprotocol', 'product': 'typescript-sdk', 'versions': [{'status': 'affected', 'version': '< 1.24.0'}]}] -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jun. 17, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2025-66414', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2025-12-02T18:42:32.031886Z'} -
Initial Analysis by [email protected]
Mar. 10, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N Added CPE Configuration OR *cpe:2.3:a:lfprojects:mcp_typescript_sdk:*:*:*:*:*:*:*:* versions up to (excluding) 1.24.0 Added Reference Type GitHub, Inc.: https://github.com/modelcontextprotocol/typescript-sdk/commit/09623e2aa5044f9e9da62c73d820a8250b9d97ed Types: Patch Added Reference Type GitHub, Inc.: https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-w48q-cv73-mx4w Types: Vendor Advisory -
New CVE Received by [email protected]
Dec. 02, 2025
Action Type Old Value New Value Added Description 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:P/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-1188 Added Reference https://github.com/modelcontextprotocol/typescript-sdk/commit/09623e2aa5044f9e9da62c73d820a8250b9d97ed Added Reference https://github.com/modelcontextprotocol/typescript-sdk/security/advisories/GHSA-w48q-cv73-mx4w