id: PYSEC-2026-2623
published: "2026-07-13T14:36:41.095636Z"
modified: "2026-07-13T16:04:48.777953Z"
aliases:
- CVE-2026-29787
- GHSA-73hc-m4hx-79pj
summary: mcp-memory-service Vulnerable to System Information Disclosure via Health Endpoint
details: "### Summary\nThe `/api/health/detailed` endpoint returns detailed system information including OS version, Python version, CPU count, memory totals, disk usage, and the full database filesystem path. When `MCP_ALLOW_ANONYMOUS_ACCESS=true` is set (required for the HTTP server to function without OAuth/API key), this endpoint is accessible without authentication. Combined with the default `0.0.0.0` binding, this exposes sensitive reconnaissance data to the entire network.\n\n### Details\n### Vulnerable Code\n\n**`health.py:90-101` - System information collection**\n\n```python\nsystem_info = {\n    \"platform\": platform.system(),              # e.g., \"Linux\", \"Darwin\"\n    \"platform_version\": platform.version(),     # Full OS kernel version string\n    \"python_version\": platform.python_version(),# e.g., \"3.12.1\"\n    \"cpu_count\": psutil.cpu_count(),            # CPU core count\n    \"memory_total_gb\": round(memory_info.total / (1024**3), 2),\n    \"memory_available_gb\": round(memory_info.available / (1024**3), 2),\n    \"memory_percent\": memory_info.percent,\n    \"disk_total_gb\": round(disk_info.total / (1024**3), 2),\n    \"disk_free_gb\": round(disk_info.free / (1024**3), 2),\n    \"disk_percent\": round((disk_info.used / disk_info.total) * 100, 2)\n}\n```\n\n**`health.py:131-132` - Database path disclosure**\n\n```python\nif hasattr(storage, 'db_path'):\n    storage_info[\"database_path\"] = storage.db_path  # Full filesystem path\n```\n\n### Authentication Bypass Path\n\nThe `/api/health/detailed` endpoint uses `require_read_access` which calls `get_current_user`. When `MCP_ALLOW_ANONYMOUS_ACCESS=true`, the auth middleware grants access:\n\n```python\n# middleware.py:372-379\nif ALLOW_ANONYMOUS_ACCESS:\n    logger.debug(\"Anonymous access explicitly enabled, granting read-only access\")\n    return AuthenticationResult(\n        authenticated=True,\n        client_id=\"anonymous\",\n        scope=\"read\",\n        auth_method=\"none\"\n    )\n```\n\n**Note**: The basic `/health` endpoint (line 68) has **no auth dependency at all** and returns version and uptime information unconditionally.\n\n### Information Exposed\n\n| Field | Example Value | Reconnaissance Value |\n|-------|--------------|---------------------|\n| `platform` | `\"Linux\"` | OS fingerprinting |\n| `platform_version` | `\"#1 SMP PREEMPT_DYNAMIC...\"` | Kernel version → CVE targeting |\n| `python_version` | `\"3.12.1\"` | Python CVE targeting |\n| `cpu_count` | `8` | Resource enumeration |\n| `memory_total_gb` | `32.0` | Infrastructure profiling |\n| `database_path` | `\"/home/user/.mcp-memory/memories.db\"` | Username + file path disclosure |\n| `database_size_mb` | `45.2` | Data volume estimation |\n\n### Attack Scenario\n\n1. Attacker scans the local network for services on port 8000\n2. Finds mcp-memory-service with HTTP enabled and anonymous access\n3. Calls `GET /api/health/detailed`  (no credentials needed)\n4. Receives OS version, Python version, full database path (revealing username), system resources\n5. Uses this information to:\n   - Target known CVEs for the specific OS/Python version\n   - Identify the database file location for potential direct access\n   - Profile the system for further attacks\n \n### PoC\n\n```python\n# Show the system info that would be exposed\nimport platform, psutil\n\nsystem_info = {\n    \"platform\": platform.system(),\n    \"platform_version\": platform.version(),\n    \"python_version\": platform.python_version(),\n    \"cpu_count\": psutil.cpu_count(),\n    \"memory_total_gb\": round(psutil.virtual_memory().total / (1024**3), 2),\n}\nprint(system_info)  # All of this is returned to unauthenticated users\n```\n\n### Impact\n- **OS fingerprinting**: Exact OS and kernel version enables targeted exploit selection\n- **Path disclosure**: Database path reveals username, home directory structure, and file locations\n- **Resource enumeration**: CPU, memory, and disk info reveal infrastructure scale\n- **Reconnaissance enablement**: Combined information significantly reduces attacker effort for follow-up attacks\n\n## Remediation\n\n1. **Remove system details from default health endpoint** - return only `status`, `version`, `uptime`:\n\n```python\n@router.get(\"/health/detailed\")\nasync def detailed_health_check(\n    storage: MemoryStorage = Depends(get_storage),\n    user: AuthenticationResult = Depends(require_write_access)  # Require admin/write access\n):\n    # Only return storage stats, not system info\n    ...\n```\n\n2. **Do not expose `database_path`** - this leaks the filesystem structure:\n\n```python\n# Remove or redact\n# storage_info[\"database_path\"] = storage.db_path  # REMOVE THIS\n```\n\n3. **Add auth to basic `/health`** or limit it to status-only (no version):\n\n```python\n@router.get(\"/health\")\nasync def health_check():\n    return {\"status\": \"healthy\"}  # No version, no uptime\n```\nAlternatively, **Bind to `127.0.0.1` by default** instead of `0.0.0.0`, preventing network-based reconnaissance entirely:\n\n```python\n# In config.py — change default from '0.0.0.0' to '127.0.0.1'\nHTTP_HOST = os.getenv('MCP_HTTP_HOST', '127.0.0.1')\n```\n\nUsers who need network access can explicitly set `MCP_HTTP_HOST=0.0.0.0`, making the exposure a conscious opt-in rather than a default."
affected:
- package:
    name: mcp-memory-service
    ecosystem: PyPI
    purl: pkg:pypi/mcp-memory-service
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 10.21.0
  versions:
  - 10.0.0
  - 10.0.1
  - 10.0.2
  - 10.0.3
  - 10.1.0
  - 10.1.1
  - 10.1.2
  - 10.10.0
  - 10.10.1
  - 10.10.2
  - 10.10.3
  - 10.10.4
  - 10.10.5
  - 10.10.6
  - 10.11.0
  - 10.11.1
  - 10.11.2
  - 10.12.0
  - 10.12.1
  - 10.13.0
  - 10.13.1
  - 10.13.2
  - 10.14.0
  - 10.15.0
  - 10.15.1
  - 10.16.0
  - 10.16.1
  - 10.17.0
  - 10.17.10
  - 10.17.12
  - 10.17.13
  - 10.17.14
  - 10.17.15
  - 10.17.16
  - 10.17.2
  - 10.17.3
  - 10.17.4
  - 10.17.5
  - 10.17.6
  - 10.17.7
  - 10.17.8
  - 10.17.9
  - 10.18.0
  - 10.18.1
  - 10.18.2
  - 10.18.3
  - 10.19.0
  - 10.2.0
  - 10.2.1
  - 10.20.0
  - 10.20.1
  - 10.20.2
  - 10.20.4
  - 10.20.5
  - 10.20.6
  - 10.3.0
  - 10.4.0
  - 10.4.1
  - 10.4.2
  - 10.4.3
  - 10.4.4
  - 10.4.5
  - 10.4.6
  - 10.5.0
  - 10.5.1
  - 10.6.0
  - 10.6.1
  - 10.7.0
  - 10.7.1
  - 10.7.2
  - 10.8.0
  - 10.9.0
  - 8.24.0
  - 8.25.1
  - 8.25.2
  - 8.26.0
  - 8.27.0
  - 8.27.1
  - 8.27.2
  - 8.28.0
  - 8.28.1
  - 8.29.0
  - 8.30.0
  - 8.31.0
  - 8.32.0
  - 8.33.0
  - 8.34.0
  - 8.35.0
  - 8.36.0
  - 8.36.1
  - 8.37.0
  - 8.38.0
  - 8.38.1
  - 8.39.0
  - 8.39.1
  - 8.40.0
  - 8.41.0
  - 8.41.1
  - 8.41.2
  - 8.42.0
  - 8.42.1
  - 8.43.0
  - 8.44.0
  - 8.45.0
  - 8.45.1
  - 8.45.2
  - 8.45.3
  - 8.46.0
  - 8.46.1
  - 8.46.2
  - 8.46.3
  - 8.47.0
  - 8.47.1
  - 8.48.0
  - 8.48.1
  - 8.48.2
  - 8.48.3
  - 8.48.4
  - 8.49.0
  - 8.50.0
  - 8.50.1
  - 8.51.0
  - 8.52.0
  - 8.52.1
  - 8.52.2
  - 8.53.0
  - 8.54.0
  - 8.54.1
  - 8.54.2
  - 8.54.3
  - 8.54.4
  - 8.55.0
  - 8.57.1
  - 8.58.0
  - 8.59.0
  - 8.60.0
  - 8.61.0
  - 8.61.1
  - 8.61.2
  - 8.62.0
  - 8.62.1
  - 8.62.10
  - 8.62.11
  - 8.62.12
  - 8.62.13
  - 8.62.2
  - 8.62.3
  - 8.62.4
  - 8.62.5
  - 8.62.6
  - 8.62.7
  - 8.62.8
  - 8.62.9
  - 8.63.0
  - 8.63.1
  - 8.64.0
  - 8.65.0
  - 8.66.0
  - 8.67.0
  - 8.68.0
  - 8.68.1
  - 8.68.2
  - 8.69.0
  - 8.70.0
  - 8.71.0
  - 8.72.0
  - 8.73.0
  - 8.74.0
  - 8.75.0
  - 8.75.1
  - 8.76.0
  - 9.0.0
  - 9.0.1
  - 9.0.2
  - 9.0.3
  - 9.0.4
  - 9.0.5
  - 9.0.6
  - 9.2.0
  - 9.2.1
  - 9.3.1
references:
- type: WEB
  url: https://github.com/doobidoo/mcp-memory-service/security/advisories/GHSA-73hc-m4hx-79pj
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-29787
- type: WEB
  url: https://github.com/doobidoo/mcp-memory-service/commit/18f4323ca92763196aa2922f691dfbeb6bd84e48
- type: PACKAGE
  url: https://github.com/doobidoo/mcp-memory-service
- type: PACKAGE
  url: https://pypi.org/project/mcp-memory-service
- type: ADVISORY
  url: https://github.com/advisories/GHSA-73hc-m4hx-79pj
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N