{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-47427","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","state":"PUBLISHED","assignerShortName":"GitHub_M","dateReserved":"2026-05-19T19:37:43.527Z","datePublished":"2026-07-28T15:32:27.294Z","dateUpdated":"2026-07-28T17:31:19.108Z"},"containers":{"cna":{"title":"GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler","problemTypes":[{"descriptions":[{"cweId":"CWE-476","lang":"en","description":"CWE-476: NULL Pointer Dereference","type":"CWE"}]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":7.5,"baseSeverity":"HIGH","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"NONE","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"references":[{"name":"https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7","tags":["x_refsource_CONFIRM"],"url":"https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7"},{"name":"https://github.com/github/github-mcp-server/pull/2502","tags":["x_refsource_MISC"],"url":"https://github.com/github/github-mcp-server/pull/2502"},{"name":"https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58","tags":["x_refsource_MISC"],"url":"https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58"},{"name":"https://github.com/github/github-mcp-server/releases/tag/v1.1.0","tags":["x_refsource_MISC"],"url":"https://github.com/github/github-mcp-server/releases/tag/v1.1.0"}],"affected":[{"vendor":"github","product":"github-mcp-server","versions":[{"version":"< 1.1.0","status":"affected"}]}],"providerMetadata":{"orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","shortName":"GitHub_M","dateUpdated":"2026-07-28T15:32:27.294Z"},"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."}],"source":{"advisory":"GHSA-w4q6-qw23-4rg7","discovery":"UNKNOWN"}},"adp":[{"references":[{"url":"https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-07-28T17:31:12.371732Z","id":"CVE-2026-47427","options":[{"Exploitation":"poc"},{"Automatable":"yes"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2026-07-28T17:31:19.108Z"}}]}}