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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Litellm | — | Upgrade LiteLLM to the latest version | Sep 11, 2026 | Jul 8, 2026 |
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