CVE-2026-42271 (GCVE-0-2026-42271)

Vulnerability from cvelistv5 – Published: 2026-05-08 03:35 – Updated: 2026-05-08 03:35
VLAI?
Title
LiteLLM: Authenticated command execution via MCP stdio test endpoints
Summary
LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.74.2 to before version 1.83.7, two endpoints used to preview an MCP server before saving it — POST /mcp-rest/test/connection and POST /mcp-rest/test/tools/list — accepted a full server configuration in the request body, including the command, args, and env fields used by the stdio transport. When called with a stdio configuration, the endpoints attempted to connect, which spawned the supplied command as a subprocess on the proxy host with the privileges of the proxy process. The endpoints were gated only by a valid proxy API key, with no role check. Any authenticated user — including holders of low-privilege internal-user keys — could therefore run arbitrary commands on the host. This issue has been patched in version 1.83.7.
Severity ?
8.7 (High)
CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/SC:H/SI:N/SA:N
CWE
  • CWE-77 - Improper Neutralization of Special Elements used in a Command ('Command Injection')
  • CWE-78 - Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
Assigner
References
Impacted products
Vendor Product Version
BerriAI litellm Affected: >= 1.74.2, < 1.83.7
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{
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          "vendor": "BerriAI",
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            }
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        }
      ],
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            "subConfidentialityImpact": "HIGH",
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            "version": "4.0",
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            "vulnIntegrityImpact": "HIGH"
          }
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      ],
      "problemTypes": [
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            {
              "cweId": "CWE-77",
              "description": "CWE-77: Improper Neutralization of Special Elements used in a Command (\u0027Command Injection\u0027)",
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            }
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          "descriptions": [
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      "providerMetadata": {
        "dateUpdated": "2026-05-08T03:35:16.758Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
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      "references": [
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          "name": "https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g",
          "tags": [
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          ],
          "url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g"
        },
        {
          "name": "https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable"
        }
      ],
      "source": {
        "advisory": "GHSA-v4p8-mg3p-g94g",
        "discovery": "UNKNOWN"
      },
      "title": "LiteLLM: Authenticated command execution via MCP stdio test endpoints"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42271",
    "datePublished": "2026-05-08T03:35:16.758Z",
    "dateReserved": "2026-04-26T11:53:27.707Z",
    "dateUpdated": "2026-05-08T03:35:16.758Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
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      "date": "2026-05-08",
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      "percentile": "0.14308"
    },
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  }
}


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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.