CVE-2026-47427

{"id": "CVE-2026-47427", "cveTags": [], "metrics": {"ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-47427", "role": "CISA Coordinator", "options": [{"exploitation": "poc"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "version": "2.0.3", "timestamp": "2026-07-28T17:31:12.371732Z"}}], "cvssMetricV31": [{"type": "Secondary", "source": "security-advisories@github.com", "cvssData": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 7.5, "attackVector": "NETWORK", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "NONE", "confidentialityImpact": "NONE"}, "impactScore": 3.6, "exploitabilityScore": 3.9}]}, "affected": [{"source": "security-advisories@github.com", "affectedData": [{"vendor": "github", "product": "github-mcp-server", "versions": [{"status": "affected", "version": "< 1.1.0"}]}]}], "published": "2026-07-28T16:18:14.853", "references": [{"url": "https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58", "tags": ["Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/github/github-mcp-server/pull/2502", "tags": ["Issue Tracking", "Patch"], "source": "security-advisories@github.com"}, {"url": "https://github.com/github/github-mcp-server/releases/tag/v1.1.0", "tags": ["Release Notes"], "source": "security-advisories@github.com"}, {"url": "https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7", "tags": ["Exploit", "Vendor Advisory"], "source": "security-advisories@github.com"}, {"url": "https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7", "tags": ["Exploit", "Vendor Advisory"], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0"}], "vulnStatus": "Analyzed", "weaknesses": [{"type": "Secondary", "source": "security-advisories@github.com", "description": [{"lang": "en", "value": "CWE-476"}]}], "descriptions": [{"lang": "en", "value": "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."}, {"lang": "es", "value": "El Servidor MCP de GitHub es el Servidor MCP oficial de GitHub. Antes de la 1.1.0, la funci\u00f3n CompletionsHandler en pkg/github/server.go accede a params.Ref sin verificar primero si es nulo, por lo que una solicitud de completion/complete con un campo ref faltante o vac\u00edo desencadena una desreferenciaci\u00f3n de puntero nulo y un p\u00e1nico en tiempo de ejecuci\u00f3n de Go; debido a que el fallo ocurre antes de cualquier autenticaci\u00f3n o validaci\u00f3n de token, cualquier cliente no autenticado capaz de enviar mensajes JSON-RPC puede hacer que el servidor falle, resultando en una denegaci\u00f3n de servicio completa. Este problema est\u00e1 solucionado en la versi\u00f3n 1.1.0."}], "lastModified": "2026-10-24T13:10:00.147", "configurations": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:a:github:mcp_server:*:*:*:*:*:*:*:*", "vulnerable": true, "matchCriteriaId": "FEBF9CB4-D9DD-4A31-B17E-F5B42B16AEE1", "versionEndExcluding": "1.1.0"}], "operator": "OR"}]}], "sourceIdentifier": "security-advisories@github.com"}