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© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2026-42271

98
FAUCET Score

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.

First published: May 8, 2026Last modified: May 9, 2026

Impacted Technologies

VendorProductVersion(s)CPE
>= 1.74.2, < 1.83.7CPE matchmatch criteria
cpe:2.3:a:litellm:litellm:*:*:*:*:*:*:*:*
>= 2.25, < 2.25.8CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_ai:*:*:*:*:*:*:*:*
>= 3.3, < 3.3.4CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_ai:*:*:*:*:*:*:*:*
3.4CPE matchmatch criteria
cpe:2.3:a:redhat:openshift_ai:3.4:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 4.0

8.7HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Attack Requirements
PRESENT
Privileges Required
LOW
User Interaction
NONE
VS Confidentiality
HIGH
VS Integrity
HIGH
VS Availability
HIGH
SS Confidentiality
HIGH
SS Integrity
NONE
SS Availability
NONE
Exploit Maturity
NOT_DEFINED
CvssVersion
4.0

Exploit Intelligence

EPSS Score
83.01%
Probability of exploitation in next 30 days
EPSS Percentile
99.6%
Percentile rank of EPSS score among Peer Group
As of 2026-07-26
Model: v2026.06.15
Added to KEV · Jun 8, 2026
Nuclei: CVE-2026-42271 · Jun 2, 2026
This CVE's current EPSS score of 0.8301 is in the 100th percentile among its peer group of 17,823 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

github_advisorypatch availablevia nvd_reference
View patch
pippatch availablevia ghsa
Product: litellmFixed in: 1.83.7

Vendor Advisories (1)

pipGHSA-v4p8-mg3p-g94ghigh

LiteLLM: Authenticated command execution via MCP stdio test endpoints

Apr 25, 2026

References

access.redhat.com / errata/RHSA-2026:27784
Third Party Advisory
access.redhat.com / errata/RHSA-2026:28960
Third Party Advisory
access.redhat.com / errata/RHSA-2026:30056
Third Party Advisory
access.redhat.com / security/cve/CVE-2026-42271
Third Party Advisory
bugzilla.redhat.com / show_bug.cgi
Third Party Advisory
security.access.redhat.com / data/csaf/v2/vex/2026/cve-2026-42271.json
Third Party Advisory
cisa.gov / known-exploited-vulnerabilities-catalog
US Government Resource
github.com / BerriAI/litellm/releases/tag/v1.83.7-stable
ProductRelease Notes
github.com / BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g
MitigationPatchVendor Advisory