GitHub Vulnerabilities and Affected Products
Vulnerabilities associated with github-mcp-server.
Products
Clear product- Enterprise Server82 vulnerabilities
- GitHub Enterprise Server46 vulnerabilities
- enterprise_server15 vulnerabilities
- cmark-gfm10 vulnerabilities
- Opensearch3 vulnerabilities
- cli2 vulnerabilities
- codeql-action2 vulnerabilities
- copilot-cli2 vulnerabilities
- github-mcp-server2 vulnerabilities
- codeql-cli-binaries1 vulnerability
- github1 vulnerability
- go-gh1 vulnerability
- paste-markdown1 vulnerability
- secure_headers1 vulnerability
- trilogy1 vulnerability
- view_component1 vulnerability
- vscode-codeql1 vulnerability
- Webiness Inventory1 vulnerability
| Vulnerability | Title and context | CVSS | EPSS | PoCs | Signals | STIX action |
|---|---|---|---|---|---|---|
CVE-2026-47427HIGH | GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete HandlerGitHub 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 ser… CWE-476Jul 28, 2026 | CVSS7.5v3.1 | EPSS0.41% | PoCs0 | SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templates | STIX |
CVE-2026-48529MEDIUM | GitHub MCP Server: Lockdown mode singleton in HTTP server causes cross-user GraphQL client confusionGitHub MCP Server is GitHub's official MCP Server. From 0.22.0 until 1.1.2, when running in HTTP mode with --lockdown-mode enabled, the RepoAccessCache is implemented as a process-global singleton initialized with the first authenticated user's GraphQL client. All subsequent requests from different users share this singleton and their lockdown-related GraphQL queries are executed using the first user's credentials. The singleton is never updated to reflect later users' tokens. This vulnerability… CWE-284Jun 26, 2026 | CVSS6.0v3.1 | EPSS0.139% | PoCs0 | SignalsNot listed in CISA KEVNo known ransomware useNo Nuclei templates | STIX |