Vulnerability in giskard-checks (CVE-2026-40320)
Summary
Vulnerability in giskard-checks (CVE-2026-40320). Successful exploitation can lead to full system takeover. Exploitable via ConformityCheck. Mitigation: upgrade to 1.0.2b1 or later.
Original description
The description as published by the source.
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 inadvertently passing untrusted input to it when integrating the library into a larger system.
Affected Component
conformity.py, line 59:
from jinja2 import Template
...
formatted_rule = Template(self.rule).render(trace=trace)
Affected Versions
giskard-checks < 1.0.2b1
Patched Version
giskard-checks >= 1.0.2b1 (template parsing removed from rule evaluation entirely)
Remediation
Upgrade to giskard-checks >= 1.0.2b1. The templa…
Source: OSV.dev (Open Source Vulnerabilities) NVD GitHub Advisory OSV
Auto-generated summary
Assembled by SecPulse from the source data (CVSS, CWE, affected versions) using templates — no AI involved. Check the original description and references below for exact details.
A vulnerability tracked as CVE-2026-40320 has been found in giskard-checks.
Attackers can target a specific entry point like ConformityCheck over the network to misuse the product.
Successful exploitation can lead to full system takeover.
What to do: upgrade giskard-checks to 1.0.2b1 or later.
If unsure, ask your IT team or search "giskard-checks CVE-2026-40320" on the vendor's site.
CVE-2026-40320 (giskard-checks) — CWE-1336
Attack vector: local / unauthenticated
Attack surface: ConformityCheck / rule / conformity.py
Patched: 1.0.2b1 — apply immediately
Plan: 1) Audit SBOM/dependencies, 2) Stage→prod upgrade, 3) Add WAF/proxy monitoring on affected endpoints, 4) Hunt IOCs in logs.
Refs: see the GHSA / vendor advisory / patched release linked on this page.
A vulnerability (CWE-1336) exists in giskard-checks. Attackers reach the vulnerable code path via ConformityCheck without authentication.
Check the vendor advisory for the affected versions of giskard-checks. Attack surface: ConformityCheck / rule / conformity.py.
Severity: ?. Successful exploitation can lead to full system takeover.
Update to 1.0.2b1.
Until the patch is applied: disable the affected feature, apply WAF rules, or restrict access via network ACLs.
Search webserver/proxy logs for unusual request patterns matching this CVE's known IOCs. Run grep -r 'giskard-checks' . against your dependency files (package-lock.json, requirements.txt, go.sum) to find affected services.
Response actions
Concrete steps and command examples for SOC/SRE teams to execute in order
-
1Identify exposure identify
grep -r 'giskard-checks' . | grep -v node_modulesリポジトリと本番環境の依存ファイル (package-lock.json / requirements.txt / go.sum / Gemfile.lock 等) で
giskard-checksを grep し、稼働しているサービス・バージョンを把握する。 -
2Apply patch patch
Upgrade giskard-checks to 1.0.2b1ステージング環境で 1.0.2b1 に上げて回帰テスト → 本番反映。回帰テストはアプリの主要ハッピーパスを含めること。
-
3Post-deployment verification verify
Confirm patched version is live in productionパッチ適用後、ステージングで PoC または同等の悪用パターンを再現して脆弱性が閉じたことを確認。本番ではアクセスログ・WAF でアラート再発が無いか継続監視。
Affected packages
References
- advisory nvd.nist.gov
- package github.com
- web github.com
- web github.com