CVE-2026-47427

GitHub MCP Server

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.

CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Weakness

• CWE-476

References

• github.comPatch
• github.comIssue TrackingPatch
• github.comRelease Notes
• github.comExploitVendor Advisory
• github.comExploitVendor Advisory

CVE-2026-47427 on NVD

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