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CVE-2026-59951— MCP Python SDK: Unbounded Session Accumulation in StreamableHTTP Transport Enables Resource Exhaustion

一分钟漏洞结论

影响对象
modelcontextprotocol python-sdk
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。

The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.8.0 until 1.30.0 and 2.2.0, stateful Streamable HTTP servers, including FastMCP, MCPServer, Server.streamable_http_app(), and StreamableHTTPSessionMa

CVSS 6.9 · Medium

影响版本矩阵 2

厂商产品 版本范围状态
modelcontextprotocol python-sdk >= 1.8.0, < 1.30.0 affected
>= 2.0.0, < 2.2.0 affected
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一、 漏洞 CVE-2026-59951 基础信息

漏洞信息

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Vulnerability Title
MCP Python SDK: Unbounded Session Accumulation in StreamableHTTP Transport Enables Resource Exhaustion
来源: CVE Program / CVE List V5
Vulnerability Description
The MCP Python SDK, called mcp on PyPI, is a Python implementation of the Model Context Protocol (MCP). From 1.8.0 until 1.30.0 and 2.2.0, stateful Streamable HTTP servers, including FastMCP, MCPServer, Server.streamable_http_app(), and StreamableHTTPSessionManager, retain session entries without an idle expiration or aggregate session-count limit. DELETE, refused opening requests, and completed sessions do not reliably discard their entries, and each entry can retain parsed initialize parameters. A client that can reach the endpoint can therefore create ordinary short requests that grow server memory without bound until restart. Stateless HTTP, stdio, and SSE transports are not affected. This issue is fixed in versions 1.30.0 and 2.2.0.
来源: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
来源: CVE Program / CVE List V5
Vulnerability Type
未加控制的资源消耗(资源穷尽)
来源: CVE Program / CVE List V5

受影响产品

厂商 产品 影响版本 CPE 订阅
modelcontextprotocol python-sdk >= 1.8.0, < 1.30.0 -

二、漏洞 CVE-2026-59951 的公开POC

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三、漏洞 CVE-2026-59951 的情报信息

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CVE-2026-59951 补丁与修复 (4)

CVE-2026-59951 其他参考 (3)

同批安全公告 · modelcontextprotocol · 2026-10-14 · 共 3 条

CVE-2026-108395 7.5 HIGH Model Context Protocol Java SDK HTTP server transports allow memory exhaustion through unb
CVE-2026-109527 7.5 HIGH Model Context Protocol Python SDK HTTP and OAuth endpoints allow memory exhaustion through

IV. Related Vulnerabilities

Same product: python-sdk
Same vendor: modelcontextprotocol
Same weakness: CWE-400

V. Comments for CVE-2026-59951

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