CRITICAL CISA KEV

CVE-2026-42208

CVSS v3

9.8

CRITICAL

EPSS Score

0.1 %

exploit probability

CISA KEV

Yes

known exploited

Exploitation

—

SSVC status

Description

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. From version 1.81.16 to before version 1.83.7, a database query used during proxy API key checks mixed the caller-supplied key value into the query text instead of passing it as a separate parameter. An unauthenticated attacker could send a specially crafted Authorization header to any LLM API route (for example POST /chat/completions) and reach this query through the proxy's error-handling path. An attacker co

CISA Known Exploited Vulnerability

Date Added: 2026-05-08
Patch Due Date: 2026-05-11
Ransomware Use: Unknown

Technical details

Published: 2026-05-08

Frequently asked questions

What is CVE-2026-42208?

Is CVE-2026-42208 actively exploited?

Yes. CVE-2026-42208 is on the CISA Known Exploited Vulnerabilities (KEV) catalog, meaning it has been confirmed as actively exploited in the wild. CISA requires federal agencies to patch by 2026-05-11.

What is the CVSS score for CVE-2026-42208?

CVE-2026-42208 has a CVSS v3 base score of 9.8 (CRITICAL severity).

Is CVE-2026-42208 affecting your environment?

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