CVE-2026-46439 in compliance-trestle
Summary
by MITRE • 08/14/2026
compliance-trestle is a tooling platform for managing compliance as code. Versions prior to 3.12.2 and 4.0.3 have a Server-Side Template Injection (SSTI) vulnerability exists in the `trestle author jinja` command. The command recursively evaluates rendered templates, allowing an attacker to achieve arbitrary command execution with privileges of the running process by injecting malicious payloads into data fields (such as SSP documents or Lookup Tables). The vulnerability does not require attacker control of the template itself. Only attacker-controlled input data rendered into a trusted template is required. This distinction is critical: the template author may only intend to render plain text (e.g., `Title: {{ ssp.metadata.title }}`), but because of the recursive parsing, the data field itself becomes executable. The vulnerability is caused by recursive re-compilation and re-rendering of already-rendered output. Versions 3.12.3 and 4.0.3 patch the issue.
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Analysis
by VulDB Data Team • 08/14/2026
The compliance-trestle platform serves as a critical infrastructure tool for managing compliance as code, enabling organizations to automate and standardize their compliance documentation processes through programmable templates and data structures. This vulnerability exists within the `trestle author jinja` command functionality that handles template processing and rendering operations. The Server-Side Template Injection (SSTI) flaw represents a severe security weakness that fundamentally undermines the platform's integrity by allowing unauthorized command execution through carefully crafted malicious inputs.
The technical exploitation occurs through recursive evaluation of rendered templates where the system performs repeated compilation and re-rendering operations on output that has already been processed. This recursive parsing creates an execution path where attacker-controlled data fields become executable code rather than simple text content. The vulnerability specifically targets the template rendering pipeline by leveraging the `trestle author jinja` command which processes structured data such as System Security Plan (SSP) documents and Lookup Tables. Attackers can inject malicious payloads into these data fields without needing access to or control over the actual template files themselves.
The operational impact of this vulnerability extends beyond simple code execution to encompass complete system compromise when attackers leverage the elevated privileges of the running process. This creates a significant risk for organizations relying on compliance-trestle for critical security documentation, as malicious actors could potentially escalate privileges, access sensitive compliance data, or disrupt automated compliance workflows. The recursive nature of the flaw means that even seemingly benign template variables containing attacker-controlled inputs can be transformed into dangerous execution vectors during the rendering process.
The vulnerability is categorized under CWE-94 as "Improper Control of Generation of Code ('Code Injection')" and aligns with ATT&CK technique T1059.001 for Command and Scripting Interpreter. The recursive re-compilation behavior creates a unique attack surface where the system's own template processing logic becomes the vector for exploitation. Organizations using affected versions face potential data breaches, system compromise, and disruption of compliance automation processes. The patching solution in versions 3.12.3 and 4.0.3 addresses the root cause by eliminating the recursive rendering behavior that enables this attack pattern.
Security practitioners should immediately assess their compliance-trestle deployments to identify affected versions and implement the appropriate updates. The vulnerability demonstrates how automated template processing systems can create unexpected execution paths when recursive operations are not properly bounded or validated, emphasizing the need for comprehensive input sanitization in all rendering pipelines. Organizations should also consider implementing additional monitoring around template processing activities and data field modifications to detect potential exploitation attempts before they can cause significant damage to compliance workflows and security posture.