# CVE-2026-54757 — oscal-compass compliance-trestle

> As of 2026-08-26, CVE-2026-54757 is a HIGH-severity vulnerability in oscal-compass compliance-trestle, CVSS v3.1 7.8, EPSS 0.2% (16.0th percentile). No Threadlinqs-tracked threat campaign has been attributed to CVE-2026-54757 as of 2026-08-26; the identifier is re-checked against the Threadlinqs threat corpus on every daily ingest.

**Last updated:** 2026-08-26

## What is CVE-2026-54757?

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.

The record classifies CVE-2026-54757 under weakness class [CWE-94](https://intel.threadlinqs.com/cwe/CWE-94). Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 41 days ago.

## Severity and exploitation probability

- **CVSS v3.1 base score:** 7.8 — HIGH (`CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H`)
- **EPSS (FIRST):** 0.2% probability of exploitation in the next 30 days, higher than 16.0% of all scored CVEs
- **CISA KEV:** Not listed in the CISA Known Exploited Vulnerabilities catalog
- **Threadlinqs priority:** 4.5/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
- **Published:** 2026-08-25, last modified 2026-08-26

## Is CVE-2026-54757 being exploited?

It currently carries a trending score of 34 in the Threadlinqs vulnerability feed.

## Affected products and versions

- **oscal-compass**: compliance-trestle

## How to fix CVE-2026-54757

No vendor patch reference has been recorded for CVE-2026-54757 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

## Threat activity tracking CVE-2026-54757

No threat campaign in the Threadlinqs corpus currently references CVE-2026-54757, in its CVE list or as an indicator. The linkage is recomputed from the live corpus on every daily ingest, so this section fills in as soon as a tracked campaign cites the identifier.

## Sources

Enriched from CVE.org, NVD, FIRST EPSS. Last verified by Threadlinqs on 2026-08-26. This product uses the NVD API but is not endorsed or certified by the NVD.

**Vendor advisory and patch**

- [github.com](https://github.com/oscal-compass/compliance-trestle/security/advisories/GHSA-jw39-3688-r4rx)

**Other references**

- [github.com](https://github.com/oscal-compass/compliance-trestle/commit/0f82d19bd42f9cc0f1b3acd7fc3f6dafe3b6ae10)
- [github.com (5335ff873a2a68eb7de43df029bea09cadff22fd)](https://github.com/oscal-compass/compliance-trestle/commit/5335ff873a2a68eb7de43df029bea09cadff22fd)

Canonical: https://intel.threadlinqs.com/cve/CVE-2026-54757
Full detection coverage and IOCs for threats exploiting CVE-2026-54757 via the Threadlinqs MCP server (Purple tier): https://intel.threadlinqs.com/mcp