CVE-2026-42208

Description

### Impact 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. ### Patches Fixed in **`1.83.7`**. The caller-supplied value is now always passed to the database as a separate parameter. Upgrade to `1.83.7` or later. ### Workarounds If upgrading is not immediately possible, set `disable_error_logs: true` under `general_settings`. This removes the path through which unauthenticated input reaches the vulnerable query. ### References - Patched release: [`v1.83.7-stable`](https://github.com/BerriAI/litellm/releases/tag/v1.83.7-stable) **Discovery Credit**: Tencent YunDing Security Lab

How to fix CVE-2026-42208

To remediate CVE-2026-42208, upgrade the affected package to a fixed version below.

• —upgrade to 1.83.7 or later

Is CVE-2026-42208 being exploited?

Yes — CVE-2026-42208 is on the CISA Known Exploited Vulnerabilities (KEV) catalog. Patch immediately.

Affected packages (1)

• >= 1.81.16, < 1.83.7

CVSS scores