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CVE-2026-42203

8.8 · HIGH

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

Published May 8, 2026CWE-1336EPSS 0.66%

Overview

CVE-2026-42203 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 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 1.80.5 to before version 1.83.7, the POST /prompts/test endpoint accepted user-supplied prompt templates and rendered them without sandboxing. A crafted template could run arbitrary code inside the LiteLLM Proxy process. The endpoint only checks that the caller presents a valid proxy API key, so any authenticated user could reach it. Depending on how the proxy is deployed, this could expose secrets in the process environment (such as provider API keys or database credentials) and allow commands to be run 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-xqmj-j6mv-4862Refaccess.redhat.com/security/cve/CVE-2026-42203Refbugzilla.redhat.com/show_bug.cgi?id=2467917Refsecurity.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-42203.json

How CyberStrike helps

Frequently asked questions

What is CVE-2026-42203?

CVE-2026-42203 is a high-severity vulnerability. It was published on May 8, 2026 and has a CVSS 3.1 base score of 8.8 (HIGH).

How severe is CVE-2026-42203?

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-2026-42203?

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-2026-42203?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-42203 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.

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