Description
The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients. From 1.8.0 until 1.30.0 and 2.2.0, streamable_http_client, streamablehttp_client, sse_client, ClientSessionGroup, OAuth, and create_mcp_http_client client paths enable follow_redirects and follow redirects to a different origin, forwarding caller-supplied custom credential headers and, for 307 or 308 responses, the request body. An attacker who can influence a trusted endpoint's redirect destination can receive that material. This issue is fixed in versions 1.30.0 and 2.2.0.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
modelcontextprotocol python-sdk
>= 1.8.0, < 1.30.0affected>= 2.0.0, < 2.2.0affected
References
- https://github.com/modelcontextprotocol/python-sdk/security/advisories/GHSA-5h93-6whr-6q8j ↗
- https://github.com/modelcontextprotocol/python-sdk/pull/3397 ↗
- https://github.com/modelcontextprotocol/python-sdk/pull/3448 ↗
- https://github.com/modelcontextprotocol/python-sdk/commit/2106335745563b2321b8c73fef2c12903d00aa6e ↗
- https://github.com/modelcontextprotocol/python-sdk/commit/c6762e821c527925f0b617db216d00fbd1d0bf99 ↗
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v1.30.0 ↗
- https://github.com/modelcontextprotocol/python-sdk/releases/tag/v2.2.0 ↗