Improper Neutralization of Special Elements Used in a Template Engine Affecting compliance-trestle package, versions [,3.12.4)[4.0.0,4.1.0)
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-PYTHON-COMPLIANCETRESTLE-20158968
- published27 Sept 2026
- disclosed24 Sept 2026
- creditUnknown
Introduced: 24 Sep 2026
NewCVE-2026-57170 (opens in a new tab)How to fix?
Upgrade compliance-trestle to version 3.12.4, 4.1.0 or higher.
Overview
compliance-trestle is a Tools to manage & autogenerate python objects representing the OSCAL layers/models
Affected versions of this package are vulnerable to Improper Neutralization of Special Elements Used in a Template Engine via the parse method in trestle/core/jinja/tags.py, where untrusted OSCAL data containing Jinja2 template syntax is re-parsed as a live template when markdown content is included via the md Jinja2 tag. An attacker who controls OSCAL prose content (for example, control descriptions or part prose) can inject Jinja2 expressions such as {{ ''.__class__.__mro__[1].__subclasses__() }} that are evaluated in the host Python environment, enabling arbitrary code execution. The fix applies a SandboxedEnvironment for re-parsing included markdown and additionally neutralizes {{/}} delimiters in prose written by _add_one_section and _write_part_info in docs_control_writer.py.