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
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
Lifecycle Timeline
9Blast 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
{% include %} and {% render %} Liquid tags. The built-in FileSystemLoader and CachingFileSystemLoader failed to reject absolute paths, escaping the configured search path; no public exploit identified at time of analysis but the vendor advisory (GHSA-8p4x-wr7x-3788) publicly documents the bypass mechanism.
Technical ContextAI
python-liquid is a Python implementation of Shopify's Liquid templating language commonly embedded in applications that accept user-authored templates (CMS, e-commerce, email rendering). The flaw is a classic CWE-22 path traversal in the loader's resolve_path() method: while the loader checked for parent-directory traversal via os.path.pardir, it did not call Path.is_absolute() before joining the requested template name to the configured search_path. Because pathlib's joinpath() discards the left operand when the right operand is absolute, supplying '/etc/passwd' (or any absolute path) caused the loader to read that path directly. The fix in liquid/builtin/loaders/file_system_loader.py adds a template_path.is_absolute() guard that raises TemplateNotFoundError, blocking absolute-path resolution alongside the existing pardir check.
RemediationAI
Vendor-released patch: upgrade python-liquid to version 2.2.0 or later via pip install --upgrade python-liquid, which adds the template_path.is_absolute() guard in resolve_path(). If upgrading is not immediately possible, the vendor-documented workaround is to subclass FileSystemLoader and override resolve_path() with the same is_absolute() check, then pass an instance of the custom loader to the Environment constructor - the trade-off is that you must maintain this subclass against future upstream changes to the loader. Operators that accept Liquid templates from untrusted users should additionally treat template authorship as a privileged action and restrict it until the upgrade lands. Full advisory and patch details are at https://github.com/jg-rp/liquid/security/advisories/GHSA-8p4x-wr7x-3788.
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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