---
cve: "CVE-2026-47427"
severity: "HIGH"
cvss: 7.5
epss: "41%"
vendor: "GitHub"
kev: false
exploited: false
published: "2026-07-28 16:18:14"
tags: [cve, security, high]
source: tsecurity.de CVE-Dossier
exported: "2026-09-16T02:53:37+02:00"
---

# CVE-2026-47427

> 7.5 HIGH · 🧪 PoC

## Beschreibung

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.

## CVSS-Vektor

```
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
```

| Metrik | Wert | Bewertung |
|---|---|---|
| AV Angriffsvektor | Netzwerk | bad |
| AC Komplexität | Gering | bad |
| PR Privilegien | Keine | bad |
| UI Interaktion | Keine | bad |
| S Scope | Unverändert | good |
| C Vertraulichkeit | Keine | good |
| I Integrität | Keine | good |
| A Verfügbarkeit | Hoch | bad |

## Patch verfügbar (OSV)

- c5be4b09c2e26e9c6adbc936b5fc661306852ebf (Commit)
- c88d2ecdd3bb07f7bdd75296e3ee676febf14f58 (Commit)

## Referenzen

- <https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7>
- <https://github.com/github/github-mcp-server/pull/2502>
- <https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58>
- <https://github.com/github/github-mcp-server/releases/tag/v1.1.0>

---
_Exportiert aus dem [tsecurity.de CVE-Dossier](https://tsecurity.de/cve?cve=CVE-2026-47427) · Datenquellen: EUVD (ENISA), NVD, OSV, CISA KEV, FIRST EPSS, Exploit-DB, BSI BITS_