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CVE-2026-47427— GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler

Quick assessment

Affected
github github-mcp-server
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

GitHub GitHub MCP Server是美国GitHub公司开源的一个Model Context Protocol（模型上下文协议）服务器实现。 GitHub MCP Server 1.1.0之前版本存在异常处理不当漏洞，该漏洞源于CompletionsHandler函数在访问params.Ref时未检查是否为nil，导致未经身份验证的客户端通过发送缺少或为空ref字段的completion/complete请求触发空指针解引用和Go运行时恐慌，造成服务器拒绝服务。

CVSS 7.5 · High EPSS 0.77% · P54

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 1

VendorProduct Version RangeStatus
github github-mcp-server < 1.1.0 affected
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I. Basic Information for CVE-2026-47427

Vulnerability Information
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Vulnerability Title
GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler
Source: CVE Program / CVE List V5
Vulnerability Description
GitHub MCP Server is GitHub's official MCP Server. Prior to 1.1.0, the CompletionsHandler function in pkg/github/server.go accesses params.Ref without first checking whether it is nil, so a completion/complete request with a missing or empty ref field triggers a nil pointer dereference and a Go runtime panic; because the crash occurs before any authentication or token validation, any unauthenticated client able to send JSON-RPC messages can crash the server, resulting in a complete denial of service. This issue is fixed in version 1.1.0.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
空指针解引用
Source: CVE Program / CVE List V5
Vulnerability Title
GitHub MCP Server 异常处理不当漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
GitHub GitHub MCP Server是美国GitHub公司开源的一个Model Context Protocol（模型上下文协议）服务器实现。 GitHub MCP Server 1.1.0之前版本存在异常处理不当漏洞，该漏洞源于CompletionsHandler函数在访问params.Ref时未检查是否为nil，导致未经身份验证的客户端通过发送缺少或为空ref字段的completion/complete请求触发空指针解引用和Go运行时恐慌，造成服务器拒绝服务。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
github github-mcp-server < 1.1.0 -

II. Public POCs for CVE-2026-47427

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6117 chars
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III. Intelligence Information for CVE-2026-47427

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Patches & Fixes for CVE-2026-47427 (2)

Vendor Advisories for CVE-2026-47427 (1)

IV. Related Vulnerabilities

Same product: github-mcp-server
Same vendor: github
Same weakness: CWE-476

V. Comments for CVE-2026-47427

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