GHSA-8P4X-WR7X-3788

Vulnerability from github – Published: 2026-05-11 14:57 – Updated: 2026-05-11 14:57
VLAI
Summary
python-liquid: Absolute paths escape filesystem loader search path
Details

Impact

The built-in FileSystemLoader and CachingFileSystemLoader do not guard against reading files outside their search paths when given an absolute path to resolve. This allows malicious template authors to load and render arbitrary files via the {% include %} and {% render %} tags. Targeted files would need to contain valid Liquid markup and be readable by the application process.

Patches

The issue is fixed in version 2.2.0 with the inclusion of a template_path.is_absolute() condition in liquid/builtin/loaders/file_system_loader.py.

        if os.path.pardir in template_path.parts or template_path.is_absolute():
            raise TemplateNotFoundError(template_name)

Workarounds

Create a custom template loader by inheriting from FileSystemLoader and overriding resolve_path(). Use an instance of the custom loader as the loader argument when instantiating your Liquid environment. 

import os
from pathlib import Path

from liquid import Environment
from liquid import FileSystemLoader
from liquid.exceptions import TemplateNotFoundError


class MyFileSystemLoader(FileSystemLoader):
    def resolve_path(self, template_name: str) -> Path:
        template_path = Path(template_name)

        if self.ext and not template_path.suffix:
            template_path = template_path.with_suffix(self.ext)

        if os.path.pardir in template_path.parts or template_path.is_absolute():
            raise TemplateNotFoundError(template_name)

        for path in self.search_path:
            source_path = path.joinpath(template_path)
            if not source_path.exists():
                continue
            return source_path

        raise TemplateNotFoundError(template_name)


env = Environment(loader=MyFileSystemLoader("path/to/templates/"))
Severity
8.2 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
Show details on source website
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "python-liquid"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-45017"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-22"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-11T14:57:43Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\nThe built-in `FileSystemLoader` and `CachingFileSystemLoader` do not guard against reading files outside their search paths when given an absolute path to resolve. This allows malicious template authors to load and render arbitrary files via the `{% include %}` and `{% render %}` tags. Targeted files would need to contain valid Liquid markup and be readable by the application process.\n\n### Patches\nThe issue is fixed in version 2.2.0 with the inclusion of a `template_path.is_absolute()` condition in `liquid/builtin/loaders/file_system_loader.py`.\n\n```python\n        if os.path.pardir in template_path.parts or template_path.is_absolute():\n            raise TemplateNotFoundError(template_name)\n```\n\n### Workarounds\n\nCreate a custom template loader by inheriting from `FileSystemLoader` and overriding `resolve_path()`. Use an instance of the custom loader as the `loader` argument when instantiating your Liquid environment. \n\n```python\nimport os\nfrom pathlib import Path\n\nfrom liquid import Environment\nfrom liquid import FileSystemLoader\nfrom liquid.exceptions import TemplateNotFoundError\n\n\nclass MyFileSystemLoader(FileSystemLoader):\n    def resolve_path(self, template_name: str) -\u003e Path:\n        template_path = Path(template_name)\n\n        if self.ext and not template_path.suffix:\n            template_path = template_path.with_suffix(self.ext)\n\n        if os.path.pardir in template_path.parts or template_path.is_absolute():\n            raise TemplateNotFoundError(template_name)\n\n        for path in self.search_path:\n            source_path = path.joinpath(template_path)\n            if not source_path.exists():\n                continue\n            return source_path\n\n        raise TemplateNotFoundError(template_name)\n\n\nenv = Environment(loader=MyFileSystemLoader(\"path/to/templates/\"))\n```",
  "id": "GHSA-8p4x-wr7x-3788",
  "modified": "2026-05-11T14:57:43Z",
  "published": "2026-05-11T14:57:43Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/jg-rp/liquid/security/advisories/GHSA-8p4x-wr7x-3788"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/jg-rp/liquid"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "python-liquid: Absolute paths escape filesystem loader search path"
}


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