CVE-2025-69196: Incorrect Authorization

FastMCP is the standard framework for building MCP applications. Prior to version 2.14.2, the server does not properly respect the resource parameter submitted by the client in the authorization and token request. Instead of issuing the token explicitly for the MCP server, the token is issued for...

CVE-2025-69196

creationtimestamp| type| source ---|---|--- 2026-03-15 18:01:33+00:00| published-proof-of-concept| https://github.com/PrefectHQ/fastmcp/security/advisories/GHSA-5h2m-4q8j-pqpj...

aa-rag (0.4.3), aden-hive (>=1.0.1, <=1.0.8) +363 more potentially affected by unknown CVE via fastmcp (>=2.0.0, <=2.13.3)

fastmcp PYPI version =2.0.0, =1.0.1, =1.0.2, =0.5.0, =0.4.6, =1.8.0, =0.1.1, =2.0.0.dev1, =2.0.0.dev1, =4.0.0.dev21, =0.0.1, =0.1.0, =0.0.2a1, =0.1.0, =0.1.2 and more Source cves: unknown CVE Source advisory: OSV:GHSA-RCFX-77HG-W2WV...

code-review-graph (>=1.8.0, <=2.2.3.1), iflow-mcp-automateyournetwork-aci-mcp (>=0.1.1, <=0.1.4) +4 more potentially affected by unknown CVE via fastmcp (1.0.0)

fastmcp PYPI version 1.0.0 is affected by a known vulnerability. The following packages have a transitive dependency on fastmcp and may be impacted: - code-review-graph =1.8.0, =0.1.1, =0.1.8, =0.1.0, =0.1.0, =0.3.0 - repomind 1.8.4 Source cves: unknown CVE Source advisory: OSV:GHSA-RCFX-77HG-W2W...

helm-ai (>=0.1.0, <=0.2.5), iflow-mcp-behinduall-wiki-js-mcp (1.0.0) +4 more potentially affected by unknown CVE via fastmcp (0.1.0)

fastmcp PYPI version 0.1.0 is affected by a known vulnerability. The following packages have a transitive dependency on fastmcp and may be impacted: - helm-ai =0.1.0, =0.1.0, =0.1.1, =0.1.12 Source cves: unknown CVE Source advisory: OSV:GHSA-RCFX-77HG-W2WV...

aa-rag (0.4.3), aden-hive (>=1.0.1, <=1.0.8) +363 more potentially affected by CVE-2025-66416 via fastmcp (>=2.0.0, <=2.13.3)

fastmcp PYPI version =2.0.0, =1.0.1, =1.0.2, =0.5.0, =0.4.6, =1.8.0, =0.1.1, =2.0.0.dev1, =2.0.0.dev1, =4.0.0.dev21, =0.0.1, =0.1.0, =0.0.2a1, =0.1.0, =0.1.2 and more Source cves: CVE-2025-66416 Source advisory: GHSA-RCFX-77HG-W2WV...

FastMCP updated to MCP 1.23+ due to CVE-2025-66416

There was a recent CVE report on MCP: https://nvd.nist.gov/vuln/detail/CVE-2025-66416. FastMCP does not use any of the affected components of the MCP SDK directly. However, FastMCP versions prior to 2.14.0 did allow MCP SDK versions 1.23 that were vulnerable to CVE-2025-66416. Users should upgrad...

grizabella (>=0.1.0b1, <=0.1.1b1), pypi-query-mcp-server (0.1.0) potentially affected by unknown CVE via fastmcp (0.2.0)

fastmcp PYPI version 0.2.0 is affected by a known vulnerability. The following packages have a transitive dependency on fastmcp and may be impacted: - grizabella =0.1.0b1, =0.1.1b1 - pypi-query-mcp-server 0.1.0 Source cves: unknown CVE Source advisory: OSV:GHSA-RCFX-77HG-W2WV...

agentfetch-mcp (>=1.0.0, <=1.0.1), constitute-mcp (>=0.1.18, <=0.1.27) +31 more potentially affected by unknown CVE via fastmcp (0.4.1)

fastmcp PYPI version 0.4.1 is affected by a known vulnerability. The following packages have a transitive dependency on fastmcp and may be impacted: - agentfetch-mcp =1.0.0, =0.1.18, =2.0.2, =1.0.0, =0.1.0, =0.1.41, =1.0.0, =1.0.1 - iflow-mcp-philschmid-code-sandbox-mcp 0.1.0 -...

EUVD-2025-205459

FastMCP updated to MCP 1.23+ due to CVE-2025-66416...

mcp-contract-builder (>=0.0.1, <=0.0.7), mcp-contract-executor (>=0.0.1, <=0.0.7) +2 more potentially affected by unknown CVE via fastmcp (0.3.5)

fastmcp PYPI version 0.3.5 is affected by a known vulnerability. The following packages have a transitive dependency on fastmcp and may be impacted: - mcp-contract-builder =0.0.1, =0.0.1, =0.1.48, =0.1.0, =0.1.3 Source cves: unknown CVE Source advisory: OSV:GHSA-RCFX-77HG-W2WV...

GHSA-RCFX-77HG-W2WV FastMCP updated to MCP 1.23+ due to CVE-2025-66416

There was a recent CVE report on MCP: https://nvd.nist.gov/vuln/detail/CVE-2025-66416. FastMCP does not use any of the affected components of the MCP SDK directly. However, FastMCP versions prior to 2.14.0 did allow MCP SDK versions 1.23 that were vulnerable to CVE-2025-66416. Users should upgrad...

Reflected Cross Site Scripting (XSS)

FastMCP is vulnerable to a reflected cross-site scripting XSS. The vulnerability is due to unescaped user-controlled input being reflected in the OAuth client callback HTML page oauthcallback.py, which allows an attacker to inject and execute arbitrary JavaScript in the context of the callback...

Command Injection

FastMCP is vulnerable to a command injection. The vulnerability is due to improper sanitization of the servername field in MCP, which allows an attacker to inject and execute arbitrary operating system commands on Windows hosts...

PT-2025-54759

Root has patched GHSA-c2jp-c369-7pvx in the rootio-fastmcp package for Root:PyPI. Multiple fixed versions available...

CVE-2025-66416 DNS Rebinding Protection Disabled by Default in Model Context Protocol Python SDK for Servers Running on Localhost

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...

CVE-2025-66416

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...

CVE-2025-66416: Initialization of a Resource with an Insecure Default

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...

PT-2025-54696

Description The 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...

CVE-2025-62801

FastMCP is the standard framework for building MCP applications. Versions prior to 2.13.0, a command-injection vulnerability lets any attacker who can influence the servername field of an MCP execute arbitrary OS commands on Windows hosts that run fastmcp install cursor. This vulnerability is fix...