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. In mcp versions before 1.29.1 and from 2.0.0a1 through 2.0.1, the Streamable HTTP session manager, SSE message endpoint, and OAuth authorization-server routes buffer complete HTTP request bodies without enforcing a maximum size. An unauthenticated remote client able to reach an affected endpoint can send a large declared or streamed request body that consumes multiple times the body size in process memory and can repeatedly exhaust memory or terminate the server. Stdio-only servers
Read at NIST National Vulnerability Database (CVE API 2.0)
- Vendor
- Anthropic
- Product
- Claude, AI / LLM tooling
- CVSS
- 7.5
- Exposure class
- AI infrastructure
Why it ranks 15 (Routine)
- CVSS 7.5 high
- Product class: AI infrastructure
- 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-2026-109527 on this site · NVD · CVE.org · Vulnpedia
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