Open Redirect Affecting mcp package, versions [1.8.0,1.30.0)[2.0.0,2.2.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-MCP-21756857
- published27 Oct 2026
- disclosed27 Oct 2026
- creditRyan vonBrubeck, Nikhil Kumar
Introduced: 27 Oct 2026
NewCVE-2026-116685 (opens in a new tab)How to fix?
Upgrade mcp to version 1.30.0, 2.2.0 or higher.
Overview
mcp is a Model Context Protocol SDK
Affected versions of this package are vulnerable to Open Redirect via the SSE and streamable HTTP transports, which follow redirects without restricting them to the MCP endpoint's origin. An attacker who can position a redirect (for example via a compromised or malicious server) can cause the client to send OAuth tokens or other authenticated requests to an arbitrary host, leaking credentials.