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CVE-2026-59822 affects BerriAI LiteLLM versions prior to 1.84.0. The vulnerability is in LiteLLM's MCP Streamable HTTP endpoint. An unauthenticated attacker can send a fabricated Authorization header that triggers an OAuth2 passthrough fallback path. In the vulnerable logic, failed LiteLLM key validation is replaced with an empty UserAPIKeyAuth() object, allowing the request to proceed to MCP tooling without a valid LiteLLM API key. In effect, the endpoint can be reached through an authentication-bypass condition caused by improper handling of failed authentication during OAuth2 passthrough fallback.
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Cross-references every affected SKU, including bundled OEM variants.
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