CVE-2026-85666: OGX server-side request forgery via MCP server_url in /v1/responses

Summary

OGX (formerly Llama Stack, affected at commit fbe8e0f) has an unauthenticated server-side request forgery flaw in the OpenAI-compatible POST /v1/responses endpoint. The server_url parameter in MCP tool definitions is fetched server-side without the validate_url_not_private() check used for other URL inputs. On the default starter configuration, which runs without authentication, a remote attacker can make the server connect to arbitrary internal addresses, including cloud metadata endpoints such as http://169.254.169.254/, and forward attacker-supplied headers and bearer tokens to them.

Mitigation

The source does not state a fix yet. Check the original advisory for updates.

Topics

• Model Context Protocol

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