CVE-2026-104120: modelcontextprotocol mcp-server-fetch/mcp-server-everything Fetch Tool server.py fetch_url server-side request forgery
A security vulnerability has been detected in modelcontextprotocol mcp-server-fetch and mcp-server-everything up to 2026.6.4. Affected is the function fetchurl of the file mcpserverfetch/server.py of the component Fetch Tool. The manipulation of the argument url/path leads to server-side request forgery. The attack may be initiated remotely. The exploit has been disclosed publicly and may be used. The pull request to fix this issue awaits acceptance.
Affected Software
Event History
Frequently Asked Questions
Which deployments should be treated as affected?
Deployments of modelcontextprotocol mcp-server-fetch or mcp-server-everything up to version 2026.6.4 are affected where the Fetch Tool uses fetch_url in mcp_server_fetch/server.py.
What does an attacker need to exploit this issue?
The issue can be initiated remotely and requires manipulation of the url or path argument passed to fetch_url. The supplied data does not identify any authentication or user-interaction prerequisite.
Is public exploit information available?
Yes. The exploit has been publicly disclosed and may be used.
Is a fix available now?
A pull request intended to fix the issue exists, but it is awaiting acceptance. The provided information does not identify an accepted patched release or a workaround.