Giskard has Unsandboxed Jinja2 Template Rendering in ConformityCheck

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS 4.0

5.4 · 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 · score source

EPSS

• CVE-2026-40320: 0.14% estimated exploitation activity in the next 30 days; percentile 3.71 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The 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. 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. However, the implicit template evaluation of the rule parameter is not obvious from the API surface. This hidden behavior increases the likelihood of a developer…

Published by the source

14 Apr 2026, 23:13 UTC

Last modified by the source

13 Jul 2026, 16:43 UTC

Source last checked

26 Oct 2026, 13:40 UTC

1. Revision 3 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-7xjm-g8f4-rp26

2. Revision 2 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-7xjm-g8f4-rp26

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# Patch Next advisory brief: CVE-2026-40320

Advisory: Giskard has Unsandboxed Jinja2 Template Rendering in ConformityCheck
IDs: CVE-2026-40320, GHSA-7xjm-g8f4-rp26
Record: https://patchnext.com/advisories/cve-2026-40320 (revision 3, source checked 26 Oct 2026, 13:40 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Medium (CVSS 5.4)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: giskard-checks 1.0.2b1. A vendor fix does not mean a deployment is fixed.

## Affected components
- PyPI giskard-checks: affected <= 1.0.1b1; fixed in 1.0.2b1

## Suggested inspection (read-only)
- `python -m pip show giskard-checks`: prints the installed version. Run with the environment that serves production active.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on giskard-checks.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-7xjm-g8f4-rp26 (OSV record GHSA-7xjm-g8f4-rp26 lists affected ranges: PyPI giskard-checks >=0 <1.0.2b1 (fixed))
- Verified: https://github.com/advisories/GHSA-7xjm-g8f4-rp26 (GitHub-reviewed advisory GHSA-7xjm-g8f4-rp26 lists affected ranges: PyPI giskard-checks >=0 <=1.0.1b1)

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