CVE-2026-49468

Critical

Description

LiteLLM is a proxy server (AI Gateway) to call LLM APIs in OpenAI (or native) format. Prior to 1.84.0, a Host-header parsing flaw in the LiteLLM proxy could, under specific conditions, allow unauthenticated access to protected management routes. The auth layer derived the effective route from request.url.path in litellm/proxy/auth/auth_utils.py::get_request_route(), which Starlette reconstructs from the Host header. A crafted Host could therefore make the auth gate evaluate a different route from the one FastAPI dispatched. This vulnerability is fixed in 1.84.0.

SeverityCritical

CVSS9.8

Exploit probability—

ProductLitellm

PublishedJun 22, 2026

First seenJun 22, 2026

Weakness typeCWE-290CWE-290

How to fix

Update

litellm litellm1.84.0 or later
litellm1.84.0 or later

Affected products

Product	Affected versions	Fixed in
litellm litellm	v < 1.84.0	1.84.0
litellmPyPI	v < 1.84.0	1.84.0

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