Vulnerabilities CVE-2026-47427

CVE-2026-47427

High

Open

TLP:CLEAR

GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler

NVD CVE.org

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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.

Details

CVSS Score: 7.5
EPSS Score ⓘ: 0.41%

33.9th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Confidence: 90%
Published: Jul 28, 2026
Last Modified: Jul 28, 2026

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