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

> CVE-2026-42271: LiteLLM: Authenticated command execution via MCP stdio test endpoints. CVSS 8.8 (CVSS 3.1), in CISA KEV.

Canonical: https://rewindex.com/cve/CVE-2026-42271
Last updated: 2026-07-15T02:21:30Z

- Published: 2026-05-08 03:35 UTC · Updated: 2026-07-15 02:21 UTC · Assigner: GitHub\_M
- CVSS: 8.8 (CVSS 3.1) · Severity: High · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS: 91.4%, 100th percentile (scored 2026-10-25)
- CISA KEV: yes, added 2026-06-08, federal due date 2026-06-22, ransomware use: Unknown
- CWE: CWE-77, CWE-78

## Description

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.

## CISA required action

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

## Affected vendors and products

- BerriAI: litellm
- Red Hat: Exploit Intelligence
- Red Hat: Red Hat Ansible Automation Platform 2
- Red Hat: Red Hat OpenShift AI 2.25
- Red Hat: Red Hat OpenShift AI 3.3
- Red Hat: Red Hat OpenShift AI 3.4
- Red Hat: Red Hat OpenShift AI (RHOAI)

## References

- [CVE record on cve.org](https://www.cve.org/CVERecord?id=CVE-2026-42271)
- [NVD entry](https://nvd.nist.gov/vuln/detail/CVE-2026-42271)
- [https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable](https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable)
- [https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g](https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g)

---

_Sources: CVE records from the CVE Program (cve.org). CVE® is a registered trademark of The MITRE Corporation. (https://www.cve.org/) This product uses data from the NVD API but is not endorsed or certified by the NVD. (https://nvd.nist.gov/) Known Exploited Vulnerabilities catalog from CISA. (https://www.cisa.gov/known-exploited-vulnerabilities-catalog) EPSS scores from FIRST (Exploit Prediction Scoring System). (https://www.first.org/epss/)_


---
Canonical: https://rewindex.com/cve/CVE-2026-42271 · Markdown: https://rewindex.com/cve/CVE-2026-42271.md · JSON: https://rewindex.com/api/v1/cves/CVE-2026-42271 · Data licensed CC BY 4.0 (https://creativecommons.org/licenses/by/4.0/) · Generated 2026-10-26T03:01:45.965Z