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CVE-2026-42271

LiteLLM: Authenticated command execution via MCP stdio test endpoints

Published: May 8, 2026Updated: Jul 15, 2026 Sources: CVE List NVDCWE-77
8.8HIGH
NVD MITRE
EPSS Score
83.0%
Top 0.4%
CISA KEV
Active Exploitation
Since Jun 8, 2026
Exploits
No Known Exploits
Remediation
Workaround Only
Self-Check
Nuclei · OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-77CWE-78

Affected Products

litellm
oss-project
litellmMixed
AI / ML / llm-serving-inference
redhat
commercial·USaka red hat
openshift aiOn-prem
Operating Systems / linux-distro
BerriAI
commercialaka berriai/litellm, litellm
litellmSaaS
AI / ML / llm-serving-inference

Exploitability

CISA Known Exploited Vulnerability
Added to KEV:Jun 8, 2026
Remediation due:Jun 22, 2026

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.

Workaround Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique
Execution
View detailed technique mapping

References

https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
github.com
https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
github.com
https://access.redhat.com/errata/RHSA-2026:27784
access.redhat.com
and 6 more references View all →
News mentions
5

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