Security Advisory

CVE-2026-59822

CVE vulnerability detail - eXtreme Datacenter Security Operations

Published 2026-07-08 19:32:18

Last updated 2026-07-09 14:31:08

Assigner GitHub_M

CVSS score 8.8

State PUBLISHED

Description

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.

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