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Medium

OpenClaw before 2026.8.1 Sandbox Policy Bypass via MCP Loopback

Type: advisorySources: OSV

OpenClaw versions before 2026.8.1 contain a sandbox policy bypass vulnerability in the MCP loopback component that allows sandboxed coding-agent sessions to invoke tools explicitly denied by sandbox.tools.deny policy. Attackers can list and invoke denied tools to access data or perform actions the operator intended to exclude from the sandbox.

Products
Not specified
Affected versions
Not specified
Fixed versions
Not specified
CVEs
CVE-2026-100573
Confirmed fixed CVEs
Not specified
Updated in this feed
2 Nov 2026, 23:52 UTC · Revision 1

Source evidence

OpenClaw before 2026.8.1 Sandbox Policy Bypass via MCP Loopback

core-osv · Original source

Published 26 Sept 2026, 02:19 UTC

OpenClaw versions before 2026.8.1 contain a sandbox policy bypass vulnerability in the MCP loopback component that allows sandboxed coding-agent sessions to invoke tools explicitly denied by sandbox.tools.deny policy. Attackers can list and invoke denied tools to access data or perform actions the operator intended to exclude from the sandbox.

osv:CVE-2026-100573
Complete source record
{
  "id": "34b73791a30434ca3b0e5b3916a3142ed3ba40c976d2de58d9c65c600a71b7ab",
  "url": "https://osv.dev/vulnerability/CVE-2026-100573",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "OpenClaw before 2026.8.1 Sandbox Policy Bypass via MCP Loopback",
    "summary": "OpenClaw versions before 2026.8.1 contain a sandbox policy bypass vulnerability in the MCP loopback component that allows sandboxed coding-agent sessions to invoke tools explicitly denied by sandbox.tools.deny policy. Attackers can list and invoke denied tools to access data or perform actions the operator intended to exclude from the sandbox.",
    "evidence": "osv:CVE-2026-100573",
    "products": [],
    "severity": "medium",
    "structured": {
      "id": "CVE-2026-100573",
      "aliases": [
        "CVE-2026-100573",
        "GHSA-5m4g-88rg-69pj"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/openclaw/openclaw",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "ea806575e6450e4d1efdfc72c19f04be982a1b9b"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StandardRange"
                  },
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "2026.8.1"
                      }
                    ],
                    "source": "DESCRIPTION"
                  }
                ]
              }
            }
          ],
          "versions": [
            "release-publish/e11c566824b1-1787940135",
            "release-publish/6ddb9f049fb3-1787938179",
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            "release-publish/8858944a81c5-20260717",
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            "release-publish/08987d8f409b-20260717",
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            "release-publish/0e9db6005954-20260717",
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            "release-publish/bb1a7e506927-20260715",
            "v2026.4.19-beta.2",
            "v2026.4.19-beta.1",
            "v2026.4.15",
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          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-100573.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:24.674641395Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100573.json",
        "https://github.com/openclaw/openclaw/security/advisories/GHSA-5m4g-88rg-69pj",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-100573",
        "https://www.vulncheck.com/advisories/openclaw-before-2026.8.1-sandbox-policy-bypass-via-mcp-loopback"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-862"
        ],
        "cna_assigner": "VulnCheck",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/100xxx/CVE-2026-100573.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-100573",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 490999,
  "published_at": "2026-09-26T02:19:01.589+00:00"
}