Bug 2524207 (CVE-2026-57170)

Summary: CVE-2026-57170 compliance-trestle: Trestle: Arbitrary code execution via Server-Side Template Injection
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akoudelk, lbragsta, wenshen
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in compliance-trestle. The custom Jinja2 include tags, `mdsection_include` and `md_clean_include`, incorrectly re-parse the content of included Markdown files as Jinja2 template code in a non-sandboxed environment. This vulnerability, known as Server-Side Template Injection (SSTI), allows an attacker to embed malicious Jinja2 syntax within OSCAL data. When processed, this malicious code can be executed, leading to arbitrary code execution.
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Description OSIDB Bzimport 2026-08-25 23:31:42 UTC 
Compliance-trestle (Trestle) is a Python SDK and command-line tool for managing OSCAL compliance documents. In versions prior to 3.12.4 and 4.0.0 through 4.0.3, the custom Jinja2 include tags mdsection_include and md_clean_include re-parse the content of an included Markdown file as Jinja2 template code in a non-sandboxed environment, allowing server-side template injection that can lead to arbitrary code execution. The MDSectionInclude and MDCleanInclude tags in Trestle/core/jinja/tags.py pass included file content to Parser(self.environment, ...).parse(), splicing it into the host template's compilation, and the environment is a plain jinja2.Environment rather than a SandboxedEnvironment, so any expressions in the file are evaluated with full access to the usual SSTI gadget chain. Because Trestle's Markdown writers emit OSCAL prose and component-description fields verbatim, applying delimiter neutralization only to parameter tables, attacker-controlled OSCAL data such as a control statement, part prose, or component description containing Jinja2 syntax flows into an included Markdown file and is executed when the include tag re-parses it. This issue is fixed in version 4.1.0.