GHSA-WXXX-GVQV-XP7P

Vulnerability from github – Published: 2026-05-11 16:17 – Updated: 2026-05-11 16:17
VLAI?
Summary
LiteLLM has a sandbox escape in custom-code guardrail
Details

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

Severity ?
8.8 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.5 (High)
CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
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{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "litellm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.81.8"
            },
            {
              "fixed": "1.83.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40217"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-420",
      "CWE-913"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-05-11T16:17:23Z",
    "nvd_published_at": null,
    "severity": "HIGH"
  },
  "details": "### Impact\n\nThe `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 \u2014 which runs as root in the default Docker image.\n\n**Reaching the endpoint requires a proxy-admin credential** in default configurations.\n\n### Patches\n\nFixed in **`1.83.11`**. The hand-rolled sandbox has been replaced with `RestrictedPython`. Upgrade to `1.83.11` or later.\n\n### Workarounds\n\nIf upgrading is not immediately possible, block `POST /guardrails/test_custom_code` at your reverse proxy or API gateway.\n\n### References\n\n- Patched release: [`v1.83.10-stable`](https://github.com/BerriAI/litellm/releases/tag/v1.83.10-stable)",
  "id": "GHSA-wxxx-gvqv-xp7p",
  "modified": "2026-05-11T16:17:23Z",
  "published": "2026-05-11T16:17:23Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-wxxx-gvqv-xp7p"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-40217"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/BerriAI/litellm"
    },
    {
      "type": "WEB",
      "url": "https://github.com/BerriAI/litellm/releases/tag/v1.83.10-stable"
    },
    {
      "type": "WEB",
      "url": "https://www.x41-dsec.de/lab/advisories/x41-2026-001-litellm"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "LiteLLM has a sandbox escape in custom-code guardrail"
}


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Detection rules are retrieved from Rulezet.