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TI-2026-41912 Aliases CVE-2026-58197GHSA-qg2g-g9w3-m5h8

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

Priority HIGH 73CWE-284Published · Updated

Key facts

Attack vector
Adjacent network
Privileges required
None
User interaction
Required
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
High · High · High
Fix status
Fixed

Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV
EPSS 0.00372 31st percentileScored 2026-11-07
Fix Fixed toolhive (stacklok): 0.30.1toolhive-studio (stacklok): 0.38.0+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
Poc
Automatable
No
Technical impact
Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
stackloktoolhivebefore 0.30.10.30.1Patch availableCNA
stackloktoolhive-studiobefore 0.38.00.38.0Patch availableCNA
—github.com/stacklok/toolhive (Go)before 0.30.10.30.1Patch availableGHSA-qg2g-g9w3-m5h8
  • toolhive Vendorstacklok Affected before 0.30.1 Fixed in 0.30.1 Patch available CNA
  • toolhive-studio Vendorstacklok Affected before 0.38.0 Fixed in 0.38.0 Patch available CNA
  • github.com/stacklok/toolhive (Go) Vendor— Affected before 0.30.1 Fixed in 0.30.1 Patch available GHSA-qg2g-g9w3-m5h8

Remediation

  • Fix · CNA toolhive (stacklok) Fixed in 0.30.1
  • Fix · CNA toolhive-studio (stacklok) Fixed in 0.38.0
  • Fix · GHSA-qg2g-g9w3-m5h8 github.com/stacklok/toolhive (Go) Fixed in 0.30.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-58197
  2. 2026-10-03 Alias added: GHSA-qg2g-g9w3-m5h8

References

Other 8

  • TI-2024-22541 Minder's Github Webhook Handler vulnerable to denial of service from un-validated requests CVSS 3.1HIGH 7.5
  • TI-2026-41911 ToolHive: SSRF in remote MCP server authentication discovery (host-side, bypasses container isolation) CVSS 3.1MEDIUM 4.7
  • TI-2024-25220 Denial of service from maliciously configured Git repository in Minder CVSS 3.1MEDIUM 5.7
  • TI-2024-23307 Denial of service of Minder Server from maliciously crafted GitHub attestations CVSS 3.1MEDIUM 5.3
  • TI-2024-23266 Stacklok Minder vulnerable to denial of service from maliciously crafted templates CVSS 3.1MEDIUM 5.3
  • TI-2024-23259 Denial of service of Minder Server with attacker-controlled REST endpoint CVSS 3.1MEDIUM 5.3
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences