CVEvulnerability
CVE-2026-47427
7.5 HIGH
Official page ↗
- Status
- Analyzed
- Published
- 2026-07-28
- Last modified
- 2026-10-24
- Assigner
- [email protected]
- CVSS 3.1 ([email protected])
- 7.5 HIGH — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- Weaknesses
- CWE-476
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.
Affected configurations
• github mcp server (< 1.1.0)
Related
Weakness · CWE (1)
- CWE-476 NULL Pointer Dereference weakness
References
- https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58 Patch
- https://github.com/github/github-mcp-server/pull/2502 Issue Tracking, Patch
- https://github.com/github/github-mcp-server/releases/tag/v1.1.0 Release Notes
- https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7 Exploit, Vendor Advisory
- https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7 Exploit, Vendor Advisory