CVE-2026-57170 oscal-compass CVE debrief

Who should care

Defenders managing OSCAL compliance documents with Trestle, especially in environments where Trestle is used to manage sensitive data, should assess exposure and prioritize patching or mitigating this vulnerability.

Why it matters

CVE-2026-57170 is a high-severity vulnerability in Compliance-trestle (Trestle) that allows server-side template injection, potentially leading to arbitrary code execution. Defenders managing OSCAL compliance documents with Trestle should assess exposure and prioritize patching or mitigating this vulnerability.

• Potential arbitrary code execution
• Server-side template injection
• OSCAL data tampering or unauthorized access

Technical summary

The custom Jinja2 include tags mdsection_include and md_clean_include in Trestle 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. This issue affects versions prior to 3.12.4 and 4.0.0 through 4.0.3, and is fixed in version 4.1.0. Defenders managing OSCAL compliance documents with Trestle should assess exposure and prioritize patching or mitigating this vulnerability, especially in environments where Trestle is used to manage sensitive data.

Defensive priority

Defenders should prioritize patching or mitigating this vulnerability, especially in environments where Trestle is used to manage OSCAL compliance documents.

Recommended defensive actions

• Patch Trestle to version 4.1.0 or later
• Review and mitigate OSCAL data for potential Jinja2 syntax
• Monitor Trestle usage for suspicious activity
• Review compensating controls for exposed systems while remediation is scheduled and verified
• Check relevant monitoring, detection, and logs for exposed assets that need extra review
• Track exceptions, retest remediated assets, and close the item only after evidence is documented
• Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record and NVD vulnerability detail page provide information on the vulnerability, its impact, and the affected versions. The source references provide additional information on the fix and the vulnerability.

Sources and references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.