CVE-2026-47427
7.5 · HIGHOverview
CVE-2026-47427 is a high-severity vulnerability affecting github mcp_server. It was published on July 28, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical 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.
Remediation
Check the references section for vendor advisories and patches from github. Update mcp_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| github | mcp_server | >= 0, < 1.1.0 | Affected |
References
Frequently Asked Questions
What is CVE-2026-47427?
CVE-2026-47427 is a high-severity vulnerability affecting github mcp_server. It was published on July 28, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).
How severe is CVE-2026-47427?
This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-47427?
Check the references section for vendor advisories and patches from github. Update mcp_server to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-47427?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-47427 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
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