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CVE-2026-42271LiteLLM: Authenticated command execution via MCP stdio test endpoints

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.

8.7 HIGHEPSS 91.44%⚡ Known Exploited (CISA KEV)NVD: Analyzed

OverviewAffected ProductsReferences
NVD CVE.org

Overview

Severity

ScoreSeverityVersionVector String
8.7HIGH4.0GitHub_M (CNA)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
8.8HIGH3.1NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CISA required action

⚡ Known exploited · remediation due Jun 22, 2026

Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

Details

CVE ID
CVE-2026-42271
Status
Analyzed
Assigner (CNA)
GitHub_M
Published
May 8, 2026
Last modified
2026-10-26 20:10 UTC
Weaknesses
  • 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')

Sources

Refreshed hourly from the sources above. Last fetched 2026-11-08 08:55 UTC.