CVE-2026-47427
High
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.
SeverityHigh
CVSS7.5
Exploit probability—
ProductGithub Mcp Server
PublishedJul 28, 2026
First seenJul 28, 2026
Weakness typeCWE-476NULL pointer dereference
How to fix
Update
- github mcp_server1.1.0 or later
- github.com/github/github-mcp-server1.1.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| github mcp_server | v < 1.1.0 | 1.1.0 |
| github.com/github/github-mcp-serverGo | v < 1.1.0 | 1.1.0 |
Check your version
Choose the product and enter the version you run to see whether it falls in the affected range.
In the Intelligence 360 plan
Attack Surface Management
See the assets tied to your domains, the technologies they run and known vulnerabilities in one list.