$ cve CVE-2026-42271 JSON

CVE-2026-42271 KEV

8.8

HIGH · CVSS 3.1 · EPSS 12.8% (pctl 96)

Patch first

On CISA KEV — known exploited in the wild, due 2026-06-22.

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.

Scoring

CVSS	8.8 (HIGH, v3.1)
Vector	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS	12.75% — more likely to be exploited than 96% of all CVEs
Weakness	CWE-77
On CISA KEV	yes — remediate by 2026-06-22
Public exploit	none known
Published	2026-05-08
Last modified	2026-07-15

CISA KEV

Name	BerriAI LiteLLM Command Injection Vulnerability
Added	2026-06-08
Due	2026-06-22
Vendor / product	BerriAI / LiteLLM
Ransomware use	none reported

Affected (2)

Vendor	Product
litellm	litellm
redhat	openshift ai

References

→ the Explorer · watch your stack · NVD