SECUFOCUSNOW
Home›CVE index›CVE-2026-42271
CISA KEV · Known exploitedHigh

CVE-2026-42271

BerriAI litellm, Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.3

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 we...

CVSS
8.7
EPSS
83.0%
99.6% percentile
CISA KEV
Listed
Published
2026.05.08
PRIORITY ASSESSMENT

Immediate review

CISA has listed this vulnerability in the Known Exploited Vulnerabilities catalog.

Known exploitationConfirmed by CISA KEV
Exploit probability83.0%
Technical severityCVSS 8.7

Vulnerability overview

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 we...

Affected product and versions

Product
BerriAI litellm, Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.3
Affected versions
>= >= 1.74.2, < 1.83.7, >= 1.74.2 < 1.83.7, >= 2.25 < 2.25.8, >= 3.3 < 3.3.4, 3.4
Fixed versions
1.83.7, 2.25.8, 3.3.4

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
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.

Due date: 2026.06.22
  1. 1
    Identify

    Confirm that BerriAI litellm, Red Hat OpenShift AI 2.25, Red Hat OpenShift AI 3.3 and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
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:X/V:X/RE:X/U:X
CWE
CWE-77, CWE-78
KEV added
2026.06.08
Ransomware use
미확인