GHSA-wxxx-gvqv-xp7pHighCVSS 8.8

LiteLLM has a sandbox escape in custom-code guardrail

Published
May 11, 2026
Last Modified
May 11, 2026

🔗 CVE IDs covered (1)

CVE-2026-40217 →

📋 Description

Impact

The POST /guardrails/test_custom_code endpoint runs user-supplied Python inside a hand-rolled sandbox. The sandbox can be escaped using bytecode-level techniques, allowing arbitrary code execution in the proxy process — which runs as root in the default Docker image.

Reaching the endpoint requires a proxy-admin credential in default configurations.

Patches

Fixed in 1.83.11. The hand-rolled sandbox has been replaced with RestrictedPython. Upgrade to 1.83.11 or later.

Workarounds

If upgrading is not immediately possible, block POST /guardrails/test_custom_code at your reverse proxy or API gateway.

References

🎯 Affected products1

  • pip/litellm:>= 1.81.8, < 1.83.10

🔗 References (5)