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

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

https://cvefeed.io/rssfeed/latest.atom / Tue, 07/28/2026 - 19:08
CVE ID :CVE-2026-47427
Published : July 28, 2026, 4:18 p.m. | 34 minutes ago
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.
Severity: 7.5 | HIGH
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