{"id":"CVE-2026-40320","aliases":["GHSA-7xjm-g8f4-rp26","PYSEC-2026-2488"],"title":"Giskard has Unsandboxed Jinja2 Template Rendering in ConformityCheck","summary":"Giskard has Unsandboxed Jinja2 Template Rendering in ConformityCheck","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","vendor":"giskard-checks","product":"giskard-checks","ecosystem":"pip","affected":["giskard-checks < 1.0.2b1"],"patched":["giskard-checks 1.0.2b1"],"published":"2026-04-14","updated":"2026-07-13","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-7xjm-g8f4-rp26","references":[{"url":"https://github.com/Giskard-AI/giskard-oss/security/advisories/GHSA-7xjm-g8f4-rp26"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-40320"},{"url":"https://github.com/Giskard-AI/giskard-oss"},{"url":"https://github.com/Giskard-AI/giskard-oss/releases/tag/giskard-checks%2Fv1.0.2b1"}],"tags":["osv","pip"],"epss":0.00144,"epssPercentile":0.04052,"ingestedAt":"2026-07-13T18:57:54.800Z","slug":"CVE-2026-40320","body":"## Overview\n\n## 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.\n\n## Affected packages\n\n- `giskard-checks < 1.0.2b1`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `giskard-checks 1.0.2b1`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}