LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, LiteLLM's MCP Streamable HTTP endpoint allowed an unauthenticated attacker to use a fabricated Authorization header to trigger an OAuth2 passthrough fallback path that replaced failed LiteLLM key validation with an empty UserAPIKeyAuth() object, allowing requests to reach MCP tooling without a valid LiteLLM key. This issue is fixed in version 1.84.0.
| Version | Type | Source | Base | Exp | Imp |
|---|---|---|---|---|---|
| 3.1 | Primary | NVD | 8.2 | 3.9 | 4.2 |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Primary | cve.org | 8.8 | — | — |
| 4.0 | Secondary | ENISA EUVD | 8.8 | — | — |
| 4.0 | Secondary | NVD | 8.8 | — | — |
| 4.0 | Secondary | GHSA | 8.8 | — | — |