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CVE-2026-42271

HIGH KEV CISA Exploitation: ACTIVE
8.7
CVSS 4.0
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.

Metadata

CVE ID
CVE-2026-42271
State
PUBLISHED
Assigner
GitHub_M
Reserved
2026-04-26 11:53 UTC
Published
2026-05-08 03:35 UTC
Last updated
2026-06-09 03:55 UTC
Primary CWE
CWE-77
CWE-77: Improper Neutralization of Special Elements used in …
Vendor / Product
BerriAI / litellm
Sources
cve.org  ·  NVD

Severity & Metrics

8.7 HIGH CVSS 4.0
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
SSVC — CISA Coordinator
Exploitation
ACTIVE
Automatable
no
Tech. Impact
total
CISA Known Exploited Vulnerability
Vulnerability name
BerriAI LiteLLM Command Injection Vulnerability
Vendor
BerriAI
Product
LiteLLM
Added to KEV
2026-06-08
Due date
2026-06-22
Ransomware
Not known
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.
CISA description
BerriAI LiteLLM contains a command injection vulnerability that could allow any authenticated user, including holders of low-privilege internal-user keys, to run arbitrary commands on the host.
Affected products (1)
VendorProductPlatformVersions
BerriAI litellm — >= 1.74.2, < 1.83.7
Weakness (CWE)
CWESourceDescription
CWE-77 cna CWE-77: Improper Neutralization of Special Elements used in a Command ('Command Injection')
CWE-78 cna CWE-78: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')
CVSS scores (1)
ScoreSeverityVersionSourceVector
8.7 HIGH 4.0 cna 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
References (2)
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