CVE-2026-47427: GitHub MCP Server has Nil Pointer Dereference DoS in completion/complete Handler
A nil pointer dereference vulnerability in the GitHub MCP Server causes it to crash when receiving a malformed completion/complete request with missing or empty parameters. This allows any unauthenticated client to cause a complete denial of service.
References
- github.com/advisories/GHSA-w4q6-qw23-4rg7
- github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58
- github.com/github/github-mcp-server/pull/2502
- github.com/github/github-mcp-server/releases/tag/v1.1.0
- github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7
- nvd.nist.gov/vuln/detail/CVE-2026-47427
Code Behaviors & Features
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