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CVE-2026-42271

BerriAI LiteLLM CWE-77

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.

CVSS Score
8.7
High
EPSS — Exploit Probability
80%
Riskier than 100% of all CVEs
Exploitation
Confirmed in the wild
KEV since 2026-06-08
Remediation
Patch available
Federal deadline 2026-06-22
NVD entry Vendor patch PoC / advisory CISA KEV

22 articles across 6 outlets · first covered Jun 8, 2026 · latest Jun 15, 2026

Coverage timeline

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