CVE-2026-54757: Oscal-Compass Compliance-Trestle

High severity, CVSS 7.8. EPSS: 0.4% chance of exploitation in the next 30 days.

Compliance-trestle (Trestle) is a Python SDK and command-line tool for managing OSCAL compliance documents. In versions before 3.12.4 and versions 4.0.0 through 4.0.3, Trestle is vulnerable to server-side template injection that can lead to remote code execution. This occurs because the MDCleanInclude and MDSectionInclude Jinja2 tags re-parse untrusted Markdown content as template source code using a non-sandboxed jinja2.Environment. An attacker who controls content that Trestle renders, such as a crafted workspace Markdown file, a third-party SSP document, or a YAML lookup-table value, can inject a Jinja2 expression that traverses Python object internals to execute arbitrary operating system commands in the context of the Trestle process. This issue is fixed in versions 3.12.4 and 4.1.0.

Affected products

• Oscal-Compass Compliance-Trestle: before 3.12.4 (fixed in 3.12.4); from 4.0.0, before 4.1.0 (fixed in 4.1.0)

Published 2026-08-25. Last modified 2026-09-09.