{"cve":"CVE-2026-47427","nvd":{"published":"2026-07-28T16:18:14.853","modified":"2026-10-24T13:10:00.147","status":"Analyzed","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.","cvss_v4":null,"cvss_v3":{"version":"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},"cwes":["CWE-476"],"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","https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7"],"products":["github:mcp_server"],"source":"nvd","synced_at":"2026-10-24T16:53:27.712498749+00:00"},"epss":{"cve":"CVE-2026-47427","score":0.00772,"percentile":0.55394,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-w4q6-qw23-4rg7","url":"https://osv.dev/vulnerability/GHSA-w4q6-qw23-4rg7","summary":"GitHub MCP Server has Nil Pointer Dereference DoS in completion/complete Handler","modified":"2026-08-18T15:11:03.662598570Z","packages":[{"ecosystem":"Go","name":"github.com/github/github-mcp-server","purl":"pkg:golang/github.com/github/github-mcp-server","ranges":["<1.1.0"],"fixed":["1.1.0"]}]},{"id":"GO-2026-6118","url":"https://osv.dev/vulnerability/GO-2026-6118","summary":"GitHub MCP Server has Nil Pointer Dereference DoS in completion/complete Handler in github.com/github/github-mcp-server","modified":"2026-08-18T15:00:19.847205954Z","packages":[{"ecosystem":"Go","name":"github.com/github/github-mcp-server","purl":"pkg:golang/github.com/github/github-mcp-server","ranges":["<1.1.0"],"fixed":["1.1.0"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}