{"id":"PYSEC-2026-2488","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` \u003c 1.0.2b1\n \n## Patched Version\n \n`giskard-checks` \u003e= **1.0.2b1** (template parsing removed from rule evaluation entirely)\n \n## Remediation\n \nUpgrade to `giskard-checks` \u003e= 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.","aliases":["CVE-2026-40320","GHSA-7xjm-g8f4-rp26"],"modified":"2026-07-13T16:32:37.390646608Z","published":"2026-07-13T15:02:47.672303Z","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"}],"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"],"database_specific":{"source":"https://github.com/pypa/advisory-database/blob/main/vulns/giskard-checks/PYSEC-2026-2488.yaml"}}],"schema_version":"1.7.5","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"}]}