ToolHive: containerized MCP servers can reach host services via host.docker.internal, enabling lateral movement

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-58197
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-18 17:16:57 UTC
Updated2026-09-18 17:16:57 UTC
DescriptionToolHive is a utility designed to simplify the deployment and management of Model Context Protocol servers. Prior to ToolHive CLI 0.30.1 and ToolHive Studio 0.38.0, locally run MCP server containers use the default network permission profile without network isolation, permitting access to host.docker.internal while ToolHive API and MCP proxy endpoints are reachable without authentication. A malicious or compromised MCP server can use the Docker gateway to contact host-local services, other ToolHive-managed MCP proxies, or the ToolHive control plane without escaping the container. This access can expose data and logs, invoke sibling MCP tools, alter process or workload state, and disrupt services. ToolHive Studio additionally sends network_isolation as false and overrides the backend's secure isolation default. This issue is fixed in ToolHive CLI 0.30.1 and ToolHive Studio 0.38.0.

Risk And Classification

Primary CVSS: v3.1 8.8 HIGH from [email protected]

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

EPSS: 0.003600000 probability, percentile 0.298300000 (date 2026-09-20)

Problem Types: CWE-284 | CWE-306 | CWE-284 CWE-284: Improper Access Control | CWE-306 CWE-306: Missing Authentication for Critical Function

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H
3.1CNADECLARED8.8HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Stacklok Toolhive affected < 0.30.1 Not specified
CNA Stacklok Toolhive-studio affected < 0.38.0 Not specified

References

ReferenceSourceLinkTags
github.com/stacklok/toolhive/security/advisories/GHSA-qg2g-g9w3-m5h8 134c704f-9b21-4f2e-91b3-4a467353bcc0 github.com
github.com/stacklok/toolhive-studio/pull/2469 [email protected] github.com
github.com/stacklok/toolhive-studio/commit/968182d7f3ee1e55123369e66ad88... [email protected] github.com
github.com/stacklok/toolhive/pull/5583 [email protected] github.com
github.com/stacklok/toolhive/commit/d8f40cb1599b8bf66657f2dfff15bfbfc236... [email protected] github.com
github.com/stacklok/toolhive/releases/tag/v0.30.1 [email protected] github.com
github.com/stacklok/toolhive-studio/releases/tag/v0.38.0 [email protected] github.com
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