The Model Context Protocol Python SDK is the official Python SDK for Model Context Protocol servers and clients.
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.
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Modelcontextprotocol
- Product
- python-sdk
- CVSS v3.1
- 5.9 AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N
- Fix
- available
- Weakness
- CWE-200
- Exposure class
- AI infrastructure
- NVD status
- Received
Why it ranks 13 (Routine)
- CVSS v3.1 5.9 medium
- Product class: AI infrastructure
- Fix available
- Recency: items published within 24 hours gain 15, within 72 hours 6, within 7 days 2.
Links
- NIST National Vulnerability Database (CVE API 2.0) (nvd.nist.gov)
- CVE-2026-116685 on this site · NVD · CVE.org · Vulnpedia
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