CVE-2026-47427
HighCVSS 7.5Exploitation Probability (EPSS)
Elevated risk55th percentile - higher than 55% of all known CVEs
Summary
A vulnerability in GitHub MCP Server causes a Go panic (nil pointer dereference) when handling a completion/complete request with a missing or empty ref field. Since the crash occurs before authentication, any unauthenticated client can cause a denial of service.
Risk Assessment
An attacker can completely crash the MCP server, making it unavailable.
Recommendation
Update GitHub MCP Server to version 1.1.0 or later.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

