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 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.

• CWE-77
• CWE-78
• CWE-78

• https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stableProduct, Release Notes
• https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94gMitigation, Patch, Vendor Advisory
• https://access.redhat.com/errata/RHSA-2026:27784Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:28960Third Party Advisory
• https://access.redhat.com/errata/RHSA-2026:30056Third Party Advisory
• https://access.redhat.com/security/cve/CVE-2026-42271Third Party Advisory
• https://bugzilla.redhat.com/show_bug.cgi?id=2467924Third Party Advisory
• https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42271.jsonThird Party Advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271US Government Resource

Published

May 8, 2026

Last Modified

Jul 15, 2026

Status

Analyzed

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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