EUVD-2026-32907
GHSA-8p4x-wr7x-3788
Severity by source
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/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
Primary rating from GitHub Advisory · only source for this CVE.
CVSS VectorGitHub Advisory
Lifecycle Timeline
10Blast Radius
ecosystem impact- 1 pypi packages depend on python-liquid (1 direct, 0 indirect)
Ecosystem-wide dependent count for version 2.2.0.
DescriptionGitHub Advisory
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/"))AnalysisAI
Path traversal in python-liquid's FileSystemLoader allows template authors to read arbitrary files from the server's filesystem by using absolute paths in {% include %} and {% render %} tags. All versions before 2.2.0 are vulnerable. No public exploit exists, and the low EPSS score (0.06%) suggests exploitation is unlikely without additional application-level access.
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Same weakness CWE-22 – Path Traversal
View allSame technique Path Traversal
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External POC / Exploit Code
Leaving vuln.today