Copier safe template has arbitrary filesystem read/write access

{
  "id": "36f9b7cc25de617c6a1a72c130ec824b8f6b770a73288d2968d76b891482c4a2",
  "url": "https://osv.dev/vulnerability/CVE-2025-55201",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Copier safe template has arbitrary filesystem read/write access",
    "summary": "Copier library and CLI app for rendering project templates. Prior to 9.9.1, a safe template can currently read and write arbitrary files because Copier exposes a few pathlib.Path objects in the Jinja context which have unconstrained I/O methods. This effectively renders the security model w.r.t. filesystem access useless. This vulnerability is fixed in 9.9.1.",
    "evidence": "osv:CVE-2025-55201",
    "products": [],
    "severity": "high",
    "structured": {
      "id": "CVE-2025-55201",
      "aliases": [
        "CVE-2025-55201",
        "GHSA-3xw7-v6cj-5q8h",
        "PYSEC-2026-1271"
      ],
      "metrics": [
        {
          "type": "CVSS_V4",
          "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/copier-org/copier",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "165c85a1536c99af9422b70ac064cf1355347357"
                },
                {
                  "fixed": "3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "9.9.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  }
                ]
              }
            }
          ],
          "versions": [
            "v9.9.0",
            "v9.8.0",
            "v9.7.1",
            "v9.7.0",
            "v9.6.0",
            "v9.5.0",
            "v9.4.1",
            "v9.4.0",
            "v9.3.1",
            "v9.3.0",
            "v9.2.0",
            "v9.1.1",
            "v9.0.1",
            "v9.0.0",
            "v8.3.0",
            "v8.2.0",
            "v8.1.0",
            "v8.0.0",
            "v7.2.0",
            "v7.1.0",
            "v7.1.0a0",
            "v7.0.1",
            "v6.2.0",
            "v6.1.0",
            "v6.0.0",
            "v6.0.0b0",
            "v6.0.0a9",
            "v6.0.0a8",
            "v6.0.0a7",
            "v6.0.0a6",
            "v6.0.0a5",
            "v6.0.0a4",
            "v6.0.0a3",
            "v6.0.0a2",
            "v6.0.0a1",
            "v6.0.0a0",
            "v5.1.0",
            "v5.0.0",
            "v4.1.0",
            "v4.0.2",
            "v4.0.1",
            "v4.0.0",
            "v3.2.0",
            "v3.1.0",
            "v3.0.6",
            "v3.0.5",
            "v3.0.4",
            "v3.0.3",
            "v3.0.2",
            "v3.0.1",
            "v3.0.0",
            "v3.0.0-beta1",
            "v3.0.0-alpha8",
            "v3.0.0-alpha7",
            "3.0.0-alpha6",
            "3.0.0-alpha5",
            "v3.0.0-alpha4",
            "v3.0.0-alpha3",
            "v3.0.0-alpha2",
            "v3.0.0-alpha1",
            "v2.5.1",
            "v2.5.0",
            "v2.4.2",
            "v2.4.1",
            "v2.4.0",
            "v2.3.3",
            "v2.3.2",
            "v2.3.1",
            "v2.3",
            "v2.2.3",
            "1.1.1"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-55201.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:23.261332485Z",
      "provider": "osv",
      "references": [
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55201.json",
        "https://github.com/copier-org/copier/security/advisories/GHSA-3xw7-v6cj-5q8h",
        "https://nvd.nist.gov/vuln/detail/CVE-2025-55201",
        "https://github.com/copier-org/copier/commit/3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-22"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55201.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2025-55201",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 489562,
  "published_at": "2025-08-18T16:21:25.576+00:00"
}