{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "91f21c738cfcef2b47f6e58a308e94f062e2c9ea"
            },
            {
              "fixed": "165c85a1536c99af9422b70ac064cf1355347357"
            }
          ],
          "repo": "https://github.com/copier-org/copier",
          "type": "GIT"
        }
      ]
    }
  ],
  "aliases": [
    "GHSA-p7q8-grrj-3m8w"
  ],
  "database_specific": {
    "cna_assigner": "GitHub_M",
    "cwe_ids": [
      "CWE-22"
    ],
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55214.json"
  },
  "details": "Copier library and CLI app for rendering project templates. From 7.1.0 to before 9.9.1, Copier suggests that it's safe to generate a project from a safe template, i.e. one that doesn't use unsafe features like custom Jinja extensions which would require passing the --UNSAFE,--trust flag. As it turns out, a safe template can currently write files outside the destination path where a project shall be generated or updated. This is possible when rendering a generated directory structure whose rendered path is either a relative parent path or an absolute path. Constructing such paths is possible using Copier's builtin pathjoin Jinja filter and its builtin _copier_conf.sep variable, which is the platform-native path separator. This way, a malicious template author can create a template that overwrites arbitrary files (according to the user's write permissions), e.g., to cause havoc. This vulnerability is fixed in 9.9.1.",
  "id": "CVE-2025-55214",
  "modified": "2026-04-01T23:08:48.892854627Z",
  "published": "2025-08-18T16:36:46.621Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/55xxx/CVE-2025-55214.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/copier-org/copier/security/advisories/GHSA-p7q8-grrj-3m8w"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-55214"
    },
    {
      "type": "FIX",
      "url": "https://github.com/copier-org/copier/commit/fdbc0167cc22780b497e4db176feaf6f024757d6"
    }
  ],
  "schema_version": "1.7.3",
  "severity": [
    {
      "score": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:P/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Copier safe template has filesystem write access outside destination path"
}