{"id":"CVE-2026-47427","revision":"45000af91d6d482492ae108bdbf6e38c","records":[{"revision":"45000af91d6d482492ae108bdbf6e38c","observedAt":"2026-10-25T12:17:26.301+00:00","statement":{"source":"nvd","id":"CVE-2026-47427","aliases":[],"title":"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 empt…","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":"2026-07-28T16:18:14.853+00:00","modifiedAt":"2026-10-24T13:10:00.147+00:00","affected":[],"metrics":[{"system":"CVSS 3.1 · security-advisories@github.com · Secondary","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/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58","https://github.com/github/github-mcp-server/pull/2502","https://github.com/github/github-mcp-server/releases/tag/v1.1.0","https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7"],"sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-47427","license":"NIST NVD usage terms; underlying source attribution retained","enrichment":{"sourceStatus":"Analyzed","weaknesses":["CWE-476"],"productCriteria":["cpe:2.3:a:github:mcp_server:*:*:*:*:*:*:*:*"],"sourceDates":{"published":"2026-07-28T16:18:14.853","lastModified":"2026-10-24T13:10:00.147"},"relatedAdvisories":[],"note":"NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON."},"key":"nvd:CVE-2026-47427","identifiers":["CVE-2026-47427"]},"retained":false,"historicalAffected":[]}],"coverage":[]}