- High 8.7
- Known exploited (CISA KEV)
CVE-2026-42271
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…
Scores
The facts
- Published
- 8 May 2026
- Last changed
- 15 July 2026
- NVD status
- Analyzed
- Severity
- High, CVSS 8.7 out of 10 (version 4.0)
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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R… - Weakness
- Affects
- litellm litellm
- redhat openshift ai
- Known exploited
- Yes. CISA added it to the Known Exploited Vulnerabilities catalogue on 8 June 2026.
- EPSS
- 92.6% chance of exploitation activity in the next 30 days (percentile 100).
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