id: PYSEC-2026-2488
published: "2026-07-13T15:02:47.672303Z"
modified: "2026-07-13T16:04:07.565990Z"
aliases:
- CVE-2026-40320
- GHSA-7xjm-g8f4-rp26
summary: Giskard has Unsandboxed Jinja2 Template Rendering in ConformityCheck
details: "## Summary\n \nThe `ConformityCheck` class in `giskard-checks` rendered the `rule` parameter through Jinja2's default `Template()` constructor. Because the `rule` string is silently interpreted as a Jinja2 template, a developer may not realize that template expressions embedded in rule definitions are evaluated at runtime. In a scenario where check definitions are loaded from an untrusted source (e.g. a shared project file or externally contributed configuration), this could lead to arbitrary code execution.\n\n`giskard-checks` is a local developer testing library with no network-facing service. Check definitions, including the `rule` parameter, are provided in application code or project configuration files and executed locally. Exploitation requires write access to a check definition and subsequent execution of the test suite by a developer.\n\nHowever, the implicit template evaluation of the `rule` parameter is not obvious from the API surface. This hidden behavior increases the likelihood of a developer inadvertently passing untrusted input to it when integrating the library into a larger system. \n\n## Affected Component\n \n`conformity.py`, line 59:\n```python\nfrom jinja2 import Template\n...\nformatted_rule = Template(self.rule).render(trace=trace)\n```\n \n## Affected Versions\n \n`giskard-checks` < 1.0.2b1\n \n## Patched Version\n \n`giskard-checks` >= **1.0.2b1** (template parsing removed from rule evaluation entirely)\n \n## Remediation\n \nUpgrade to `giskard-checks` >= 1.0.2b1. The template rendering has been removed from rule evaluation.\n \n## Credit\n \nGiskard-AI thanks @dhabaleshwar for identifying the unsandboxed template usage."
affected:
- package:
    name: giskard-checks
    ecosystem: PyPI
    purl: pkg:pypi/giskard-checks
  ranges:
  - type: ECOSYSTEM
    events:
    - introduced: "0"
    - fixed: 1.0.2b1
  versions:
  - 1.0.1a1
  - 1.0.1a2
  - 1.0.1b1
references:
- type: WEB
  url: https://github.com/Giskard-AI/giskard-oss/security/advisories/GHSA-7xjm-g8f4-rp26
- type: ADVISORY
  url: https://nvd.nist.gov/vuln/detail/CVE-2026-40320
- type: PACKAGE
  url: https://github.com/Giskard-AI/giskard-oss
- type: WEB
  url: https://github.com/Giskard-AI/giskard-oss/releases/tag/giskard-checks%2Fv1.0.2b1
- type: PACKAGE
  url: https://pypi.org/project/giskard-checks
- type: ADVISORY
  url: https://github.com/advisories/GHSA-7xjm-g8f4-rp26
severity:
- type: CVSS_V3
  score: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
- type: CVSS_V4
  score: CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:P/VC:H/VI:H/VA:H/SC:N/SI:N/SA:L