CVE-2026-42271

BerriAI LiteLLM Command Injection

8.8 HIGHActively exploited (CISA KEV)EPSS 92.6%

Published8 May 2026
Added to CISA KEV8 Jun 2026
Remediation due22 Jun 2026

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.

CVSS 3.1 breakdown

Attack vectorNetwork

Attack complexityLow

Privileges requiredLow

User interactionNone

ScopeUnchanged

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

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

Affected products

Litellm≥ 1.74.2 < 1.83.7

Redhat Openshift Ai≥ 2.25 < 2.25.8 · ≥ 3.3 < 3.3.4 · 3.4

Remediation

Fixed in

Litellm≥ 1.83.7

Redhat Openshift Ai≥ 2.25.8

Patch & vendor advisories

https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94g

References

https://access.redhat.com/errata/RHSA-2026:27784Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:28960Third Party Advisory
https://access.redhat.com/errata/RHSA-2026:30056Third Party Advisory
https://access.redhat.com/security/cve/CVE-2026-42271Third Party Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=2467924Third Party Advisory
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stableProductRelease Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94gMitigationPatchVendor Advisory
https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42271.jsonThird Party Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271US Government Resource

Related CVEs

Recent high-severity vulnerabilities sharing a weakness type.

Frequently asked

Is CVE-2026-42271 being actively exploited?

Yes. CVE-2026-42271 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added 8 Jun 2026.

How severe is CVE-2026-42271?

CVE-2026-42271 has a CVSS 3.1 base score of 8.8, rated high. EPSS estimates a 92.6% probability of exploitation.

Which products are affected by CVE-2026-42271?

Affected products include Litellm, Redhat Openshift Ai.

How do I fix CVE-2026-42271?

Upgrade affected software to a fixed version, for example Litellm 1.83.7, Redhat Openshift Ai 2.25.8 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-42271 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. Because it is on the CISA KEV list, a risk for it never ranks below high, and the update that fixes it moves to the Emergency patch lane. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.