PYSEC-2026-2601

Vulnerability from pysec - Published: 2026-07-13 15:15 - Updated: 2026-07-13 16:04
VLAI
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
Impacted products
Name purl
litellm pkg:pypi/litellm
Aliases
To clipboard 

{
  "affected": [
    {
      "package": {
        "ecosystem": "PyPI",
        "name": "litellm",
        "purl": "pkg:pypi/litellm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "1.81.8"
            },
            {
              "fixed": "1.83.10"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.81.10",
        "1.81.11",
        "1.81.12",
        "1.81.13",
        "1.81.14",
        "1.81.15",
        "1.81.16",
        "1.81.8",
        "1.81.9",
        "1.81.9.dev1",
        "1.82.0",
        "1.82.1",
        "1.82.2",
        "1.82.3",
        "1.82.4",
        "1.82.5",
        "1.82.6",
        "1.83.0",
        "1.83.1",
        "1.83.2",
        "1.83.3",
        "1.83.4",
        "1.83.5",
        "1.83.6",
        "1.83.7",
        "1.83.8",
        "1.83.9"
      ]
    }
  ],
  "aliases": [
    "CVE-2026-40217",
    "GHSA-wxxx-gvqv-xp7p"
  ],
  "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": "PYSEC-2026-2601",
  "modified": "2026-07-13T16:04:36.768028Z",
  "published": "2026-07-13T15:15:44.443320Z",
  "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"
    },
    {
      "type": "PACKAGE",
      "url": "https://pypi.org/project/litellm"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/advisories/GHSA-wxxx-gvqv-xp7p"
    }
  ],
  "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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Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.