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archivevulnerability · 18 Sep 2026 · 17:16 UTC

GHSA-qg2g-g9w3-m5h8: ToolHive: containerized MCP servers can reach host services via host.docker.internal, enabling lateral movemen

VULNCVE-2026-58197source · GTH
HIGHHigh-risk vulnerability — CVSS 8.8

last 60 dispatches · spectrum

## Summary A containerized MCP server running with the default `network` permission profile (`insecure_allow_all: true`) can reach host-local services via `host.docker.internal`. This includes the ToolHive API itself, other ToolHive-managed MCP server proxies, and any other service listening on the host's localhost. Combined with the unauthenticated ToolHive API and MCP proxy endpoints, this enables a compromised or malicious MCP server to perform lateral movement without any container escape. …

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