BadHost CVE-2026-48710: Starlette Auth Bypass Exposes AI Agent Infrastructure to HTTP Smuggling
BadHost (CVE-2026-48710) exploits Starlette's inconsistent URL reconstruction via Host header injection, bypassing path-based auth. Affecting 400K+ repos including FastAPI, vLLM, and MCP Server, it exposes AI Agent infrastructure to data theft and potential RCE, forcing a security paradigm shift in HTTP parsing.
