oscal-compass compliance-trestle up to 3.12.1/4.0.2 Jinja trestle author jinja special elements used in a template engine

Summaryinfo

A vulnerability was found in oscal-compass compliance-trestle up to 3.12.1/4.0.2 and classified as problematic. The affected element is the function trestle author jinja of the component Jinja. Such manipulation leads to improper neutralization of special elements used in a template engine. This vulnerability is traded as CVE-2026-46439. An attack has to be approached locally. There is no exploit available.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in oscal-compass compliance-trestle up to 3.12.1/4.0.2. Affected by this issue is the function trestle author jinja of the component Jinja. The manipulation with an unknown input leads to a improper neutralization of special elements used in a template engine vulnerability. Using CWE to declare the problem leads to CWE-1336. The product uses a template engine to insert or process externally-influenced input, but it does not neutralize or incorrectly neutralizes special elements or syntax that can be interpreted as template expressions or other code directives when processed by the engine. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-46439 since 05/14/2026. The exploitation is known to be easy. The attack needs to be approached locally. Successful exploitation requires user interaction by the victim. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1221.

Upgrading to version 3.12.2 or 4.0.3 eliminates this vulnerability.

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Productinfo

Vendor

• oscal-compass

Name

• compliance-trestle

Version

• 3.12.0
• 3.12.1
• 4.0.0
• 4.0.1
• 4.0.2

Website

• Product: https://github.com/oscal-compass/compliance-trestle/

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