CVE-2026-42208

9.8 CRITICAL CISA KEV - Actively Exploited
Published: May 08, 2026 Modified: May 08, 2026
View on NVD

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 could read data from the proxy's database and may be able to modify it, leading to unauthorised access to the proxy and the credentials it manages. This issue has been patched in version 1.83.7.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable
Source: security-advisories@github.com
Product Release Notes
https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmc
Source: security-advisories@github.com
Mitigation Patch Vendor Advisory
https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-42208
Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0
US Government Resource

3 reference(s) from NVD

Quick Stats

CVSS v3 Score
9.8 / 10.0
EPSS (Exploit Probability)
56.9%
98th percentile
Exploitation Status
Actively Exploited
Remediation due: 2026-05-11

Weaknesses (CWE)

Affected Vendors

litellm