CVE-2026-47427: fallo de gravedad alta en github-mcp-server
GitHub MCP Server: Nil Pointer Dereference DoS in completion/complete Handler
Publicada el
Aviso por correo cuando entre en el KEV, tenga PoC pública o suba de nota.
21Vexday Risk Score
Sin señal de explotación. Ningún artefacto público de explotación conocido hasta ahora.
ssvc Trackcvss 7.5epss 0.8%
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:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Productos afectados
github · github-mcp-serverCVEs relacionadas — github-mcp-server
En el mismo producto, de las más peligrosas a las menos.
Referencias
https://github.com/github/github-mcp-server/commit/c88d2ecdd3bb07f7bdd75296e3ee676febf14f58https://github.com/github/github-mcp-server/pull/2502https://github.com/github/github-mcp-server/releases/tag/v1.1.0https://github.com/github/github-mcp-server/security/advisories/GHSA-w4q6-qw23-4rg7