CVE-2026-59822

Fixed upstream ExploitedEPSS <1%CVSS 8.8

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.

Published 2026-07-08 · In CISA KEV since 2026-09-02 · CVE record · OSV

Products: berriai litellm

Fixed upstream