KEVIntel
8.7
CVSS
High

CVE-2026-42271

PUBLISHED

LiteLLM: Authenticated command execution via MCP stdio test endpoints

Exploited in the wild Remote Low complexity No user interaction
Vendor
BerriAI
Product
litellm
Published
May 08, 2026
EPSS
4.1% · 89% pctl

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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 nuclei_scanner

Weaknesses (CWE)

  • Improper Neutralization of Special Elements used in a Command ('Command Injection')

  • Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')

CVSS scores

CVSS v4.0 8.7 High

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

CVSS v3.1 8.8 High

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Exploitation status

Exploited in the wild

Recorded 2026-06-08 18:00:47 UTC · CISA

Known exploited vulnerability sources

Catalogues that list this CVE as a known exploited vulnerability.

Source Added
CISA First 2026-06-08 18:00 UTC
CVE 2026-06-08 18:10 UTC
All CISA Advisories 2026-06-08 20:20 UTC
TheHackerNews 2026-06-09 07:20 UTC

Scanner integrations

Recent mentions

LiteLLM Flaw CVE-2026-42271 Exploited in the Wild, Chains to Unauthenticated RCE

TheHackerNews · Jun 09, 2026

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday added a high-severity flaw impacting BerriAI LiteLLM to its Known Exploited Vulnerabilities (KEV) catalog, citing evidence of active exploitation. The vulnerability, tracked as CVE-2026-42271 (CVSS score: 8.7), is a command injection vulnerability that could allow any authenticated user to run arbitrary commands on the

CISA Adds Two Known Exploited Vulnerabilities to Catalog

All CISA Advisories · Jun 08, 2026

CISA has added two new vulnerabilities to its Known Exploited Vulnerabilities (KEV) Catalog, based on evidence of active exploitation. CVE-2026-42271 BerriAI LiteLLM Command Injection Vulnerability CVE-2026-50751 Check Point Security Gateway Improper Authentication Vulnerability These types of vulnerabilities are a frequent attack vector for malicious cyber actors and pose significant risks to the federal enterprise. Binding Operational Directive (BOD) 22-01: Reducing the Significant Risk of Known Exploited Vulnerabilities established the KEV Catalog as a living list of known Common Vulnerabilities and Exposures (CVEs) that carry significant risk to the federal enterprise. BOD 22-01 requires Federal Civilian Executive Branch (FCEB) agencies to remediate identified vulnerabilities by the due date to protect FCEB networks against active threats. See the BOD 22-01 Fact Sheet for more information. Although BOD 22-01 only applies to FCEB agencies, CISA strongly urges all organizations to reduce their exposure to cyberattacks by prioritizing timely remediation of KEV Catalog vulnerabilities as part of their vulnerability management practice. CISA will continue to add vulnerabilities to the catalog that meet the specified criteria. 

Timeline

  • CVE ID Reserved

  • CVE Published to Public

  • Detected by Nuclei

  • Added to KEVIntel

  • KEV confirmed by CVE

  • KEV confirmed by All CISA Advisories

  • KEV confirmed by TheHackerNews