{"id":"CVE-2026-47427","revision":"74d89992abea4113a9d790eb294b347e","records":[{"revision":"74d89992abea4113a9d790eb294b347e","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-47427","aliases":[],"title":"GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler","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.","state":0,"publishedAt":"2026-07-28T15:32:27.294+00:00","modifiedAt":"2026-07-28T17:31:19.108+00:00","affected":[{"ecosystem":"Vendor product","name":"github-mcp-server","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"github\",\n                    \"product\": \"github-mcp-server\",\n                    \"versions\": [\n                        {\n                            \"version\": \"< 1.1.0\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","score":7.5,"severity":"HIGH"}],"references":["https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7","https://github.com/github/github-mcp-server/pull/2502","https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58","https://github.com/github/github-mcp-server/releases/tag/v1.1.0"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-47427","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-47427","identifiers":["CVE-2026-47427"]},"retained":false,"historicalAffected":[]}],"coverage":[]}