Vulnerability 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.
CVSS Score
CRITICAL
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Litellm | Litellm | >= 1.81.16, < 1.83.7 |
Related Weaknesses (CWE)
References
- https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stableProductRelease Notes
- https://github.com/BerriAI/litellm/security/advisories/GHSA-r75f-5x8p-qvmcMitigationPatchVendor Advisory
- https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-US Government Resource
FAQ
What is CVE-2026-42208?
CVE-2026-42208 is a vulnerability with a CVSS score of 9.8 (CRITICAL). 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-...
How severe is CVE-2026-42208?
CVE-2026-42208 has been rated CRITICAL with a CVSS base score of 9.8/10. This is considered a critical vulnerability requiring immediate attention.
Is there a patch for CVE-2026-42208?
Check the references section above for vendor advisories and patch information. Affected products include: Litellm Litellm.