Model Context Protocol Python SDK: HTTP client transports followed cross-origin redirects carrying custom headers and bodies

影響: pip:mcp >= 2.0.0, < 2.2.0 → 2.2.0, pip:mcp >= 1.8.0, < 1.30.0 → 1.30.0

In affected versions, the SDK's Streamable HTTP and SSE client transports followed HTTP redirects to any host. If the configured MCP endpoint answered with a redirect to a different origin: - custom headers set on the client (for example an X-API-Key credential) were sent to that origin, and - on a 307 or 308 redirect the request body was re-sent there too. The SDK's OAuth client providers followed redirects on their own discovery, registration and token requests in the same way. A lone Authori…

在 GitHub Advisory Database 阅读

2026/10/28 06:05，GitHub Advisory Database 发布了“Model Context Protocol Python SDK: HTTP client transports followed cross-origin redirects carrying custom headers and bodies”（类型：漏洞公告）。严重程度为“中危”（medium）。相关技术：Python。CVE：CVE-2026-116685。