Answer in brief
CVE-2026-58197 records a High severity (CVSS 8.8) vulnerability in ToolHive: containerized MCP servers can reach host services via host.docker.internal, enabling lateral movement. The current sources do not mark it as known exploited. The current feed maps stacklok/toolhive (generic), stacklok/toolhive-studio (generic), github.com/stacklok/toolhive (go), github.com/stacklok/toolhive (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 8.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps stacklok/toolhive (generic), stacklok/toolhive-studio (generic), github.com/stacklok/toolhive (go), github.com/stacklok/toolhive (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| stacklok/toolhivegeneric | <0.30.1 | 0.30.1 |
| stacklok/toolhive-studiogeneric | <0.38.0 | 0.38.0 |
| github.com/stacklok/toolhivego | <0.30.1 | 0.30.1 |
| github.com/stacklok/toolhivego | >=0 <0.30.1 | 0.30.1 |
Published upstream
Sep 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Sep 28, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 18, 2026
ToolHive 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.
Quoted source text, attributed separately from HOL analysis.