Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing

{
  "id": "45a8789d4836a654e3c41c5bfb19685b805d03bedf7bc436002b7712c78439bd",
  "url": "https://osv.dev/vulnerability/CVE-2025-66479",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Anthropic Sandbox Runtime Incorrectly Implemented Network Sandboxing",
    "summary": "Anthropic Sandbox Runtime is a lightweight sandboxing tool for enforcing filesystem and network restrictions on arbitrary processes at the OS level, without requiring a container. Prior to 0.0.16, due to a bug in sandboxing logic, sandbox-runtime did not properly enforce a network sandbox if the sandbox policy did not configure any allowed domains. This could allow sandboxed code to make network requests outside of the sandbox. A patch for this was released in v0.0.16.",
    "evidence": "osv:CVE-2025-66479",
    "products": [],
    "severity": "low",
    "structured": {
      "id": "CVE-2025-66479",
      "aliases": [
        "CVE-2025-66479",
        "GHSA-9gqj-5w7c-vx47"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:P/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/anthropics/sandbox-runtime",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "bea2930cc1db9c73a1b15acf6dc19c5261aec1f3"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "fixed": "bea2930cc1db9c73a1b15acf6dc19c5261aec1f3"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-66479.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:26.474375415Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66479.json",
        "https://github.com/anthropic-experimental/sandbox-runtime/security/advisories/GHSA-9gqj-5w7c-vx47",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-66479",
        "https://github.com/anthropic-experimental/sandbox-runtime/commit/bea2930cc1db9c73a1b15acf6dc19c5261aec1f3"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-693"
        ],
        "cna_assigner": "GitHub_M",
        "unresolved_ranges": [
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.16"
                  }
                ],
                "source": "AFFECTED_FIELD",
                "strategy": "StringRangeExpression"
              }
            ]
          },
          {
            "extracted_events": [
              {
                "range": [
                  {
                    "fixed": "0.0.16"
                  }
                ],
                "source": "DESCRIPTION"
              }
            ]
          }
        ],
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/66xxx/CVE-2025-66479.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-66479",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 493102,
  "published_at": "2025-12-04T20:57:20.631+00:00"
}