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Starlette flaw lets attackers bypass authentication on any FastAPI app using path-based auth
Security

Starlette flaw lets attackers bypass authentication on any FastAPI app using path-based auth

CVE-2026-48710, dubbed BadHost, allows an attacker to manipulate the HTTP Host header so that Starlette reports a different URL path than the server actually routed — silently bypassing any middleware that inspects request.url.path for access control. FastAPI, vLLM, LiteLLM, and MCP servers are all affected.

OSTIF / X41 D-Sec
authenticationvulnerability