Skip to content
EXYS
Back to the CVEs

CVE-2026-42271

8.8, high Known exploited

BerriAI LiteLLM Command Injection Vulnerability

NVD (opens in a new tab) CVE.org (opens in a new tab) CISA KEV catalogue (opens in a new tab)
CVSS
8.8, high high CVSS v3.1
EPSS, next 30 days
93% higher than 99.8% of scored CVEs
Exploitation
Confirmed in the wild
Published
8 May 20265 months ago

Known exploited

CISA added this to the Known Exploited Vulnerabilities Catalog on 8 Jun 2026. US federal agencies had to remediate by 22 Jun 2026, a deadline that has passed.

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.

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.

Details

Vendor
BerriAI and 1 more
Product
litellm
Weakness
CWE-77 (opens in a new tab)
Status
Analyzed
Updated
15 Jul 2026
Assigner
security-advisories@github.com

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

References 9

Patches and fixes 1

Advisories 6

Other references 2

The kind is read from NVD's tags where present and from the shape of the URL otherwise, so treat it as a hint.

Other BerriAI CVEs

Every BerriAI CVE we hold

Same vendor in what we hold, not a known link between the flaws.

  • CVE-2026-59822 BerriAI LiteLLM Improper Authentication Vulnerability KEV EPSS 0.8% 8.2, high
  • CVE-2026-42208 BerriAI LiteLLM SQL Injection Vulnerability KEV EPSS 6% 9.8, critical

Beyond this page

Is CVE-2026-42271 in your network?

This page tells you how dangerous CVE-2026-42271 is out there. Whether it sits on one of your devices, only a scan of your own network can tell. That is what our systems do, every day, for the companies we protect.

CVE-2026-42271 is in the CISA catalogue of exploited vulnerabilities: attackers are already exploiting it.

  • EXYS7600 OCELOT

    Find it before attackers do

    Ocelot scans your network on a schedule and reports every vulnerability it finds by its CVE identifier, with its CVSS score and how many of your hosts are affected. A finding like CVE-2026-42271 comes with the devices to patch.

    Learn more about EXYS7600 OCELOT

  • EXYS7950 KONDRA

    Detect it if it's exploited

    Until the patch is applied, Kondra monitors your network, events and endpoints in real time. It keeps an inventory of the software installed on every endpoint, and its anomaly detection rules flag what an attacker does once inside.

    Learn more about EXYS7950 KONDRA
Check your exposure

Assembled from the NVD 2.0 API, the CISA Known Exploited Vulnerabilities Catalog and FIRST EPSS. Scores are as of our last collection on 17 Oct 2026, not the live upstream state.