Go to homepageCyberStrike

Menu

Star on GitHub · 3.2k
Sign inDownload

CVE-2026-42271

8.8 · HIGHActively Exploited

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format.

Published May 8, 2026CWE-77EPSS 92.57%

Overview

CVE-2026-42271 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/BerriAI/litellm/releases/tag/v1.83.7-stableGitHubgithub.com/BerriAI/litellm/security/advisories/GHSA-v4p8-mg3p-g94gRefaccess.redhat.com/errata/RHSA-2026:27784Refaccess.redhat.com/errata/RHSA-2026:28960Refaccess.redhat.com/errata/RHSA-2026:30056Refaccess.redhat.com/security/cve/CVE-2026-42271Refbugzilla.redhat.com/show_bug.cgi?id=2467924Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42271.jsonCISAwww.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42271

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42271?

CVE-2026-42271 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH). This vulnerability is listed in CISA's Known Exploited Vulnerabilities catalog, indicating active exploitation in the wild.

How severe is CVE-2026-42271?

This vulnerability has a CVSS 3.1 base score of 8.8, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2026-42271?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-42271?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42271 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

Related HIGH CVEs from 2026

View all
Browse by year2026202520242023202220212020201920182017201620152014201320122011201020092008200720062005200420032002200120001999