Vulnerability Intelligence Report
LiteLLM: Authentication Bypass via Host Header Injection
CVE-2026-49468
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.
No Active Exploit Signals
CVSS Base Score
9.5
CRITICAL
EPSS Probability:0.56%
Executive Threat Verdict
Evaluating...
Evaluating Threat Landscape...
Assessing known weaponization, exploitation telemetry, and federal advisories.
Attack Surface
—
Authentication
—
Weaponization
—
SSVC Action
—
Weaknesses (CWE)
CWE-290 ↗CWE-290: Authentication Bypass by Spoofing
Affected Products & Versions
| Vendor | Product | Affected Versions |
|---|---|---|
| BerriAI | litellm | < 1.84.0 (affected) |
References & Technical Advisories
No reference links found.
Threat Intelligence Signals
EPSS Score
0.559%
GitHub Advisory
Identity & Timeline
| Status | PUBLISHED |
| Assigning Authority | GitHub, Inc. · Vendor · USA |
| Reserved | 2026-05-30T04:17:43 |
| Published | 2026-06-22T20:37:14 |
| Last Updated | 2026-07-15T00:47:34 |
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