A critical unauthenticated remote code execution vulnerability exists in LiteLLM due to improper input handling in the MCP stdio test endpoint. An attacker can send a specially crafted request to the `/mcp-rest/test/connection` endpoint with controlled parameters, resulting in arbitrary command execution on the server. When combined with an authentication bypass technique—such as the Starlette BadHost flaw (CVE-2026-48710)—an unauthenticated attacker can exploit the chain to execute commands as the server process. Exploitation allows an attacker to spawn processes with the privileges of the LiteLLM server, potentially leading to complete compromise of the host.
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