CVE-2026-49468criticalCWE-290

CVE-2026-49468: critical vulnerability in BerriAI litellm

LiteLLM: Authentication Bypass via Host Header Injection

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63Vexday Risk Score

Patch soon. It has a working public exploit.

ssvc Attendcvss 9.5epss 3.0%
from disclosure to weapon11 days
Published on NVDJun 22
1st PoC+11d
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Affected products
BerriAI · litellm
⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.
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